JP2000004670A - Granular phosphoric acid medium and material for fertilizing seedling containers using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a granular phosphoric acid medium capable of reducing a seeding work in a seedling raising process without inducing poor germination and growth and also useful for reducing the load on environmental water quality by including a specific phosphoric acid fertilizer and a material composed of vegetable fibers and granulating these components. SOLUTION: This granular phosphoric acid medium is obtained by including a delayed release phosphoric acid fertilizer and a material composed of vegetable fibers and granulating the components. Preferably, the delayed release phosphoric acid fertilizer contains an insoluble phosphoric acid as a main component and a water soluble phosphoric acid and a concentration of the contained water soluble phosphoric acid is <=1 wt.% of the granular phosphoric acid medium, and a concentration of the water soluble phosphoric acid is preferably <=5 wt.% of the delayed release phosphoric acid fertilizer, and further, the material composed of vegetable fibers can be coconut husk and/or peat-moss.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granular phosphoric acid medium, a material for applying fertilizer to a seedling container using the same, and a cultivation method using the same, and more particularly, to secure a sufficient water holding capacity as a nursery bed. The present invention relates to a granular phosphoric acid medium capable of producing a seedling container and having a total weight equal to or less than that of a conventional seedling bed soil, a material for fertilizing a seedling container using the same, and a cultivation method using the same.

[0002]

2. Description of the Related Art In recent years, a coated granular fertilizer in which the surface of an ordinary granular fertilizer has been subjected to a treatment for reducing an outflow rate for forming an organic and / or inorganic film containing a resin as a main component to suppress the outflow rate of a fertilizer component. With the development of, the whole amount of the fertilizer component required during the cultivation period or the amount of the coated granular fertilizer corresponding to most of the fertilizer component is applied to the seedling raising container in advance at the start of the seedling raising, the base fertilizer in Honda, and the additional fertilizer application Nursery container fertilization cultivation, which requires no work, is now possible. However, since it is difficult to perform the above-described process of reducing the outflow rate on the surface of the phosphate fertilizer, it was still necessary to perform basic fertilizer and top-fertilizer in Honda as before with respect to the phosphate fertilizer.

Under such circumstances, in order to suppress the outflow rate of the phosphate fertilizer, instead of performing the above-described treatment for reducing the outflow rate, granular slow-acting phosphate fertilizer typified by soluble phosphate is used. Is possible.

On the other hand, when a phosphate fertilizer and a water retention material are mixed, classification occurs due to a difference in specific gravity between the phosphate fertilizer and the water retention material. However, it is necessary to use a large amount of binder in addition to the phosphate fertilizer and water retention material, in order to give the molded or granulated material mechanical strength enough to withstand transportation and seedling raising work. Was.

[0005]

However, the main three fertilizer components (phosphoric acid component) are added to the seedling raising container using the granules of the slow-release phosphate fertilizer (phosphoric acid component) and the coated granular fertilizer (nitrogen component, Kari component). Components, nitrogen components, and potassium components) when fertilizing and cultivating seedling containers in which a large amount of fertilizer is applied, the space occupied by these fertilizers in the seedling containers increases, and all of these fertilizers have a water absorbing ability. For this reason, there is a problem that it is difficult to secure a sufficient water holding capacity as a nursery bed, even if cultivation soil having excellent water absorption properties is used in combination. In addition, in the case of fertilizer cultivation in which a large amount of the main three fertilizer components are applied to the nursery container, it is necessary to put a large amount of a fertilizer component having a higher specific gravity than a water retention material such as soil or vermiculite which is usually used in the nursery container. Therefore, the total weight of the seedling raising container, especially the weight after watering, becomes remarkable, and although the fertilization work in Honda is simplified, there is also a problem that the work load in the seedling raising work increases.
On the other hand, when a large amount of binder is mixed, there is a problem that a sufficient water holding capacity cannot be secured.

The present invention has been made in view of such problems of the prior art, and an object thereof is to eliminate the occurrence of classification caused by a difference in specific gravity between a fertilizer component and a medium material. Even when large amounts of the main three fertilizer components are applied to the seedling raising container, it is possible to apply the slow-release phosphate fertilizer required for cultivation in this field from cultivation in the seedling raising container at the seedling raising stage. After the seedling container is filled with fertilizer components, the total weight of the seedling container after irrigation becomes equal to or less than that obtained when using the conventional seedling bed soil. An object of the present invention is to provide an acid culture medium, a material for fertilizing a nursery container using the same, and a cultivation method using the same.

[0007]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, use a phosphate medium or the like obtained by granulating a slow-acting phosphate fertilizer and a plant fiber material. As a result, they have found that the above object can be achieved, and have completed the present invention.

[0008] That is, the granular phosphate medium of the present invention contains a slow-acting phosphate fertilizer and a vegetable fiber material, and is characterized by granulating these components.

The fertilizing material for a seedling raising container of the present invention is a fertilizing material obtained by filling the above-mentioned granular phosphoric acid medium into a seedling raising container, wherein the granular phosphoric acid medium, a nitrogen fertilizer component and / or
Or a slow-release fertilizer containing a potash fertilizer component.

[0010] The cultivation method of the present invention is characterized in that seedlings are grown using the above-mentioned granular phosphate medium or the above-mentioned material for fertilizing a seedling container.

[0011]

In the granular phosphate medium of the present invention, since the slow-release phosphate fertilizer and the vegetable fiber material are integrated in a granular manner,
There is no problem such as classification or poor dispersion due to the difference in specific gravity between the fertilizer component and the raw material of the culture medium due to vibration or shaking during transportation, and there is no scattering at the time of use.

[0012] The concentration of water-soluble phosphoric acid contained in the granular phosphoric acid medium of the present invention is preferably less than 1% by weight, whereby the elution of the phosphoric acid component during seedling raising is slightly suppressed. The required phosphate fertilizer component is brought into the field at the time of transplantation together with the seedlings raised as quo-soluble phosphoric acid, and thereafter the quo-soluble phosphoric acid is gradually decomposed by the root acid of the seedlings and absorbed by the seedlings. Therefore, if the amount of slow-acting phosphoric acid added to the granular phosphoric acid medium is increased or decreased, most of the life-long phosphate fertilizer component necessary for the target crop, and further, the entire amount of the fertilizer component is applied at the start of seedling raising. It is also possible to do.

In the granular phosphate medium of the present invention, the moisture content X of the granular phosphate medium is set to 0% by weight or less by a drying step or the like.
It is preferable to adjust X ≦ 20% by weight, whereby the weight of the culture medium is reduced and the generation of mold due to long-term storage is eliminated.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The granular phosphate medium of the present invention also serves as a medium for raising seedlings and a fertilizer, and contains a slow-acting phosphate fertilizer and a vegetable fiber material, and is formed by granulating these.

Generally, available phosphoric acid contained in phosphate fertilizers is classified into water-soluble phosphoric acid, soluble phosphoric acid, and potassium-soluble phosphoric acid according to their solubility. Water-soluble phosphoric acid refers to one that is soluble in water (neutral), and is fast-acting. Soluble phosphoric acid refers to one that is soluble in an aqueous solution of ammonium citrate (alkaline) and is slow-acting. Cu-soluble phosphoric acid refers to one that is soluble in a 2% aqueous citric acid solution (acidic) and is slow-acting.

The slow-acting phosphate fertilizer used in the granular phosphate medium of the present invention contains water-soluble phosphoric acid as a main component, and contains water-soluble phosphoric acid as a main component. Typical slow-release phosphate fertilizers mainly composed of soluble phosphoric acid include calcined phosphorus fertilizer, iodine phosphorus fertilizer, precipitated calcium phosphate, limestone, fluorapatite, and hydroxyapatite. Etc.

The concentration of the water-soluble phosphoric acid contained in the granular phosphoric acid medium of the present invention is preferably less than 1% by weight, more preferably less than 0.1% by weight. If the concentration of water-soluble phosphoric acid contained in the granular phosphoric acid medium exceeds 1% by weight, there is a risk of causing germination and growth disorders. Is not preferred because the carry-in amount may be reduced. When a phosphate fertilizer component necessary for raising seedlings is separately added, the concentration of water-soluble phosphoric acid contained in the granular phosphate medium may be 0% by weight. If the concentration of the water-soluble phosphoric acid contained in the granular phosphoric acid medium is 0% by weight, a large amount can be filled into the nursery box, and the amount of the phosphate fertilizer component brought into the field is not restricted. This is because the amount of the phosphate fertilizer component can be freely adjusted. It should be noted that the concentration of water-soluble phosphoric acid contained in the slow-release phosphate fertilizer varies depending on the mixing ratio with the granular phosphoric acid medium, so it is difficult to determine the concentration uniquely. When the effective phosphate fertilizer is blended in an amount of 20 to 80% by weight, the concentration of the water-soluble phosphoric acid contained in the slow-acting phosphate fertilizer is preferably less than 5% by weight in view of the above.

The form of the slow-acting phosphate fertilizer used in the granular phosphate medium of the present invention may be either powdery or granular, but from the viewpoint of uniform dispersibility when mixed with the vegetable fiber material. Powder is preferred.

The content of the slow-release phosphate fertilizer in the granular phosphate medium of the present invention is preferably 20 to 80% by weight,
0-60% by weight is more preferred. If the content of the slow-acting phosphate fertilizer in the granular phosphate medium is less than 20% by weight, the fertilizer effect in Honda will not last for a long time, and additional fertilization may be required. If exceeded,
It is not preferable because the water retention property is reduced and the weight of the granular phosphate medium itself is sometimes increased.

Since the slow-release phosphate fertilizer contained in the granular phosphate medium of the present invention has not been subjected to a treatment for reducing the dissolution rate with an organic or inorganic substance as in the prior art, the coating of the organic or inorganic substance is not applied in this field. It does not remain in the soil.

As the plant fiber material which is the main medium material of the present invention, a natural material which is lightweight and excellent in water retention is preferably used. Among them, coconut shell and peat moss are easily granulated without using a binder. It is preferably used for reasons such as being able to do so. Since coconut shell does not exhibit water repellency even when the moisture content after granulation and drying is 10% or less,
More preferably used. In addition, both coconut shell and peat moss may be used in combination.

The peat moss used in the present invention is obtained by accumulating and decomposing plant remains such as reeds, sedges, sphagnum moss growing in a lake in a cold region under anaerobic conditions.

The coconut shell used in the present invention is obtained by removing the outer and inner pericarps from the pericarp of the coconut, and removing the fibrous material and the woody portion derived from the extracted mesocarp (to fill the spaces between the mesocarp fibers). A mixture of fibrous materials and woody parts by cutting and grinding the entire mesocarp, or a more useful component (elongate fiber and medium-short fibers) called cocoa dust from mesocarp. Fiber) and a mixture of the remaining short fibers and woody parts.

Among the coconut husks, coir dust is generated in large quantities during the fiber collection process, excluding the rigid and medium-short fibers used in ropes, mats and mattresses (about 60% by weight of the entire mesocarp). It is an unnecessary component that is also called coir, pis, etc., and has been conventionally disposed of. However, in the present invention, it is particularly preferably used among coconut shells. That is, the present invention also leads to effective use of waste. The method for producing coir dust is described below. From the coconut, except the juice, endosperm, and inner rind
Dry the mesocarp. The dried outer / mesocarp is soaked in fresh water for 4 to 6 weeks to remove excess tannins and chlorides (without removing water) and to soak. Rope, mats and short fibers used for mattresses are separated from the soft outer and mesocarp,
Collect the short fibers and woody by-products as residue. The collected short fibers and woody parts are hydrated at 80-90.
It is contained in an amount of 40% to 50% by weight in the dehydration step, and the moisture content is adjusted to 20% by weight by drying in the sun or hot air. Further, the dried product is subjected to a fumigation disinfection and sterilization process to remove contamination and adjust the particle size. The type of palm from which coir dust is collected is not particularly limited, but coco palm coir dust from Sri Lanka is excellent in terms of quality and stable supply, and is preferably used. Because high-quality rigid fibers are collected from coconut palms produced in Sri Lanka, they are suitably used for fiber products such as ropes, mats and mattresses, and emit a large amount of coir dust.

The plant fiber materials that can be used in the present invention include, in addition to those listed above, bark, wood pulp, chaff, sawdust and the like.

The particle size of the vegetable fiber material used in the present invention is preferably smaller than the maximum particle size of the granulated product as the final product from the viewpoint of productivity.

As described above, the granular phosphate medium of the present invention contains the slow-release phosphate fertilizer and the vegetable fiber material as essential components. Other components besides these essential components can be added.

For example, as other water retention materials, dried sterilized soil obtained by sterilizing natural soil, vermiculite, perlite,
Minerals such as zeolite and rock wool, as well as charcoal such as black ash made from the waste of soda pulp production at paper mills, activated carbon made from the inner rind (inner shell) of rice hulls and coconut shells, and activated carbon made from wood chips Can be added for granulation. It should be noted that sterilized soil obtained by sterilizing natural soil is preferably used because the generation of bacteria can be prevented and the soil can be used safely. In addition, pesticidal active ingredients may be added and granulated, for example, insecticides, fungicides, herbicides, antiviral agents and plant growth regulators,
Acaricides, nematocides and the like can be mentioned, and the properties thereof can be either solid or liquid. Here, it is necessary to pay attention to the pH and EC (electrical conductivity) when the granular phosphate medium of the present invention is immersed in water, depending on the case. It is preferable to add a pH adjuster composed of an acidic material or an alkaline material. The pH and EC vary depending on the plant to be cultivated, but generally, the pH is 5 to 8, the EC is 0.5 mS / cm or less in the system without added fertilizer, and 1.0 to 2.0 mS in the system with added fertilizer. / Cm. When granulation is performed by adding a high-concentration fertilizer for the purpose of dilution and use as a soil amendment material, this range may be largely deviated.

The granular phosphate medium of the present invention can be added with a fast-acting fertilizer required for raising seedlings. The fast-acting fertilizer required for raising seedlings is not particularly limited, as long as it can rapidly fertilize during the seedling raising period.For example, nitrogen fertilizer, phosphate fertilizer, potassium fertilizer, compound fertilizer, ordinary chemical fertilizer , Advanced chemical fertilizers, two-component compound chemical fertilizers, chemical fertilizers containing a nitrification control agent, liquid fertilizers, trace element fertilizers, calcareous fertilizers, magnesite fertilizers, siliceous fertilizers, organic fertilizers, and composts.

The granular phosphate medium of the present invention is obtained by granulation using the above-mentioned raw material components, and can be sufficiently granulated without using a binder.
Starches such as corn starch, wheat starch, rice starch, potato starch, potato starch and tapioca starch; clay minerals of the montmorillonite group such as bentonite; Extracts, vegetable resinous adhesives such as gum arabic and tragacanth, derivatives of natural polymers such as carboxymethyl starch and carboxymethyl cellulose, and binders such as synthetic polymers such as polyvinyl alcohol and sodium polyacrylate. It can be added and granulated.

Granulation methods that can be used in the present invention include extrusion granulation, compression granulation, tumbling granulation, spray drying granulation, fluidized bed granulation, crushing granulation, and the like. A stirring granulation method, a coating granulation method and the like can be mentioned.

The granular phosphoric acid medium of the present invention is preferably granulated by a method capable of applying a shearing force and / or a compressive force. If granulation is performed by a method capable of applying a shearing force and / or a compressive force, even without using a binder,
This is because the medium containing the phosphate fertilizer and the water retention material can be granulated.

As a method capable of applying a shearing force and / or a compressing force, granulation by an extrusion granulation method and a compression / crushing granulation method is preferable. The extrusion granulation method includes, for example, a screw type pre-extrusion method, a horizontal extrusion method, a vacuum extrusion method and a combination of pre-treatment methods, a roll type disk die type and a ring die type, a blade type basket type and an oscillary type. Rating type, self-molding type gear type and cylinder type, ram type continuous type and intermittent type, etc.
Examples of the pulverization and granulation method include a tableting method and a roll press method, and both are preferably used.
In particular, a roll-type disk die or ring die that can simultaneously apply both shearing force and compressive force can be more preferably used.

Here, after granulation by a method capable of applying a shearing force and / or a compressive force, it is preferable to adjust the water content of the granular phosphate medium to a low water content by a drying step or the like. In addition, it is possible to suppress the water repellency at the time of low moisture specific to the vegetable fiber material.

The shape of the granular phosphate medium obtained by the above granulation method is not particularly limited, and may be spherical,
Any of oval sphere, pellet, polyhedron, etc. can be used. The granular phosphoric acid medium according to the present invention is particularly suitable for use in an automatic sowing and fertilizer that continuously fills a seedling box with a medium and seeds using a hopper, and a residual rate in a hopper (a so-called bridge). Is significantly lower than that of a powdered culture medium, so that the efficiency of filling the culture medium in such a sowing fertilizer can be improved.

The particle size of the granular phosphate medium of the present invention is preferably 1 to 15 mm at the longest part, more preferably 2 to 10 mm. This is because if the ratio is outside the above range, classification may be likely to occur when the particulate phosphoric acid medium and other materials described below are used in combination.

The moisture content X of the granular phosphate medium of the present invention X
Is 0 from the viewpoint of reducing the bulk specific gravity, that is,
% By weight <X ≦ 20% by weight is preferred. It is industrially difficult to completely reduce the water content to 0% by weight, and it is easy to change over time due to moisture in the air, etc. Conversely, if the water content exceeds 20% by weight, long-term storage May cause mold, and when mixed with a slow-release fertilizer whose solubility is adjusted chemically or physically, the fertilizer component may be dissolved and eluted with time due to the water content. Yes, not preferred. As a method of adjusting the moisture content of the granular phosphate medium of the present invention, if the moisture content of the granular phosphate medium can be finally adjusted to a desired value, the granular phosphate medium material is previously adjusted to a predetermined moisture rate. The water content may be adjusted and granulated, or may be adjusted to a predetermined moisture content by a drier such as a fluidized vibration drier or solar drying after granulation.

The granular phosphate medium of the present invention is preferably used by filling it in a container for raising seedlings. The seedling container used for raising seedlings may be any container capable of raising seedlings of the target plant, and may be a container of various materials, shapes and dimensions. For rice seedlings, a so-called seedling box (inner dimensions: 58c
m × 28 cm × 3 cm).

Next, the material for fertilizing a nursery container of the present invention will be described. The material for fertilizing a nursery container of the present invention comprises the above-mentioned granular phosphate medium and a slow-release fertilizer containing a nitrogen fertilizer component and / or a potassium fertilizer component. (Nitrogen, phosphoric acid, potash) enables the fertilizer to be applied to most of the seedling raising containers and further to the entire amount thereof.

As the slow-release fertilizer containing a nitrogen fertilizer component and / or a potassium fertilizer component used in the present invention, a slow-release fertilizer whose solubility is adjusted chemically or whose dissolution rate is physically adjusted is preferably used. . Examples of slow-release nitrogenous fertilizers whose solubility is chemically adjusted include, for example, isobutyraldehyde condensed urea (IBDU) and acetaldehyde condensed urea (CD
U or OMU), formaldehyde-processed urea fertilizer, guanylurea sulfate, oxamide and the like, and chemically synthesized slow-release nitrogen fertilizers. As a slow-release fertilizer with physically adjusted dissolution rate, a coated nitrogen fertilizer in which a nitrogenous fertilizer is coated with a polyolefin resin or sulfur or another coating material, and a potassium fertilizer coated with a polyolefin resin or sulfur or another coating material A coated nitrogen fertilizer, a compound fertilizer containing nitrogen and potassium or a liquid composite fertilizer coated with a polyolefin-based resin or sulfur or other coating raw material may be a nitrogen-potassium composite fertilizer.

The above granular phosphate medium may be used alone, but the above granular phosphate medium and calcined vermiculite,
Perlite, zeolite, carbide, or dried germicidal soil and any mixture thereof can be used in combination.
Further, the above-mentioned granular phosphoric acid medium can be used by mixing a material comprising an agricultural chemical active ingredient. The material comprising the pesticidal active ingredient referred to herein includes, for example, insecticides, fungicides, herbicides, antiviral agents, plant growth regulators, acaricides,
Although nematicides and the like can be mentioned, their properties may be either solid or liquid, and time-release coated pesticide granules for time-controlling the release of these pesticide active ingredients may be mixed. Mixing of the various materials described above and the granular phosphate medium,
It is preferable that the mixing be carried out within a range that does not impair the effects of the present invention and while paying attention to pH and EC (electric conductivity). p
H and EC vary depending on the plant to be cultivated, but generally, pH is 5 to 8 and EC is 0.5 m in a fertilizer-free system.
S / cm or less, 1.0-2.0 mS / cm with fertilizer addition system
It is preferred that When a high-concentration fertilizer is mixed for the purpose of dilution and use as a soil amendment material, this range may be largely deviated.

The amount of the fertilizer component to be filled in the seedling raising container can be calculated from the amount of the three main components of fertilizer required per fixed area of the main field (Honda) and the number of transplanted seedling containers per fixed area of the main field. For example, conventionally, Honda has 5 kg of nitrogen (N) and 7 k of phosphoric acid (P ₂ O ₅ ) per 10 ares.
g, potassium (K ₂ O) 5 kg, and Honda 10
When transplanting under the condition of 25 seedling boxes per are,
One box may be filled with about 200 g of nitrogen (N), about 280 g of phosphoric acid (P ₂ O ₅ ), and about 200 g of potash (K ₂ O).

The cultivation method of the present invention is based on the fact that seedlings are grown using the above-mentioned granular phosphoric acid medium or the above-mentioned material for fertilizing seedling containers. According to the cultivation method of the present invention, after the seedling container is filled with the granular phosphoric acid medium or the material for fertilizing the seedling container and the seedling is grown, if the seedling is transplanted to the main field, the entire amount or most of the necessary amount in the main field is obtained. Corresponding amounts of fertilizer components can be brought in, and fertilization and / or topdressing in this field can be omitted.

[0044]

EXAMPLES The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

1. Granulation of Granular Phosphate Medium (Example 1) Phosphate fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphate in powder; 36% by weight (guaranteed component), concentration of water-soluble phosphate; 0) .1% by weight (guaranteed component),
(Total phosphoric acid concentration; 40% by weight (measured value)) to 70% by weight,
Pulverized coconut shell mesocarp (moisture content: 10% or less, φ
4mm pass, bulk specific gravity; 0.12 g / ml, Sri Lanka) 29.1% by weight, ammonia sulfate (manufactured by Nippon Steel Chemical Co., Ltd., guaranteed component nitrogen concentration; 21% by weight) 0.6% as fertilizer for raising seedlings And 0.3% by weight of sulfuric acid Kari (manufactured by Chisso Asahi Fertilizer Co., Ltd., guaranteed component concentration: 50% by weight), and using a ribbon mixer (model: RM-60, manufactured by Fuji Paudal Co., Ltd.) Water was added and mixed so that the total water content of the raw materials became 20% by weight. This mixture is rolled into a disk die roll extrusion granulator (disk pelletizer).
Model: F40 / 33-390, manufactured by Fuji Paudal Co., Ltd.
Die and nozzle diameter: φ3mm) and hot air temperature 9
After drying in a fluidized shaker at 0 ° C. so that the moisture content of the granular phosphoric acid medium becomes 5% by weight, it is sieved to obtain 100 L of 2 to 4 mm granular phosphoric acid medium A of Example 1. Was.

(Examples 2 and 3) The same operation as in Example 1 was repeated except that the water content after granulation and drying was adjusted to 10% by weight and 30% by weight, respectively.
Each of 2 to 4 mm granular phosphate medium B (Example 2) and granular phosphate medium C (Example 3) of 100 mm
Each L was obtained.

(Example 4) Coir dust (moisture content: 10% by weight or less, particle size: 4 to 6 mm, bulk specific gravity: 0.11 g / ml, Sri Lanka) was used in place of ground coconut pulp. Other than the above, the same operation as in Example 1 was repeated, and 2 to 4 mm of the granular phosphate medium D of
0 L was obtained.

(Examples 5 and 6) The same operation as in Example 4 was repeated, except that the water content after granulation and drying was adjusted to 10% by weight and 30% by weight, respectively.
A 2-4 mm granular phosphate medium E (Example 5) and a granular phosphate medium F (Example 6) each having a size of 100 mm were used.
Each L was obtained.

(Example 7) The concentration of water-soluble phosphoric acid in a phosphoric acid fertilizer powder containing ku-soluble phosphoric acid as a main component was 0.1% by weight.
The same operation as in Example 4 was repeated except that 1.0% by weight (guaranteed component) was used instead of (guaranteed component).
100 L of a granular phosphate medium G of 2 to 4 mm according to the present example was obtained.

(Example 8) The concentration of water-soluble phosphoric acid in a phosphate fertilizer powder containing ku-soluble phosphoric acid as a main component was 0.1% by weight.
The same operation as in Example 4 was repeated, except that 2.0 wt% (guaranteed component) was used instead of (guaranteed component).
100 L of a granular phosphate medium H of 2 to 4 mm according to the present example was obtained.

(Example 9) Phosphate fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphoric acid in powder: 36% by weight (guaranteed component), concentration of water-soluble phosphate: 2.0% by weight (Guaranteed component), total phosphoric acid concentration; 40% by weight (measured value)) 30
% By weight, coir dust (water content: 10% by weight or less, particle size: 4 to 6 mm, bulk specific gravity: 0.11 g / ml,
69.1% by weight (from Sri Lanka), 0.6% by weight of ammonium sulfate (manufactured by Nippon Steel Chemical Co., Ltd., nitrogen content of a guaranteed component: 21% by weight) as a fertilizer for raising seedlings, and potassium sulfate (manufactured by Chisso Asahi Fertilizer Co., Ltd.) Guarantee component: Kari concentration: 50% by weight) 0.3% by weight is added, and the total water content of the raw materials becomes 30% by weight using a ribbon mixer (model: RM-60, manufactured by Fuji Paudal Co., Ltd.). And mixed. The mixture was granulated by a disk die roll extrusion granulator (disk pelletizer type; F40 / 33-390, manufactured by Fuji Paudal Co., Ltd., die / nozzle diameter: φ3 mm),
After drying the granular phosphoric acid medium with a hot air temperature of 90 ° C. in a fluidized vibration drier so that the moisture content of the granular phosphoric acid medium becomes 5% by weight, the granulated phosphoric acid medium is sieved. 100 L was obtained.

(Example 10) Phosphate fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphoric acid in powder; 36% by weight (guaranteed component), concentration of water-soluble phosphate: 6.0% by weight)
(Guaranteed component), total phosphoric acid concentration; 40% by weight (measured value))
10% by weight of coir dust (moisture content: 10% by weight)
Below, particle size: 4-6 mm product, bulk specific gravity: 0.11 g / m
l, from Sri Lanka) 88.8% by weight, 0.8% by weight of ammonium sulfate as a fertilizer for raising seedlings (manufactured by Nippon Steel Chemical Co., Ltd., nitrogen concentration: 21% by weight), sulfuric acid potassium (Chisso Asahi Fertilizer Co., Ltd.) Made, guaranteed component Kari concentration; 50% by weight) 0.4
% By weight, and a ribbon mixer (model: RM-60,
The raw materials were mixed and mixed so that the total water content of the raw materials became 35% by weight using Fuji Powdal Co., Ltd.). This mixture was granulated with a disk die roll-type extrusion granulator (disk pelletizer model; F40 / 33-390, manufactured by Fuji Paudal Co., Ltd., die / nozzle diameter: φ3 mm), and hot air temperature was 90 ° C. Was dried so that the moisture content of the granular phosphoric acid medium was 5% by weight, and then sieved to obtain 100 L of a 2 to 4 mm granular phosphoric acid medium J of Example 10.

(Example 11) Phosphate fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphate in powder; 36% by weight (guaranteed component), concentration of water-soluble phosphate: 0.1% by weight)
(Guaranteed component), total phosphoric acid concentration; 40% by weight (measured value))
50% by weight, 49.4% by weight of peat moss (moisture content: 10% or less, φ4mm pass, bulk specific gravity: 0.13 g / ml, produced in Canada), ammonia sulfate as a fertilizer for raising seedlings (Nippon Steel Chemical Co., Ltd.) Manufactured, guaranteed component nitrogen concentration; 21% by weight) 0.4 weight%, sulfuric acid Kari (Chisso Asahi Fertilizer Co., Ltd., guaranteed component potassium concentration: 50% by weight) 0.2% by weight, and a ribbon mixer (model; RM-60, manufactured by Fuji Paudal Co., Ltd.) and mixed with water so that the total water content of the raw materials was 20% by weight. This mixture is rolled into a disk die roll extrusion granulator (disk pelletizer).
Model: F40 / 33-390, manufactured by Fuji Paudal Co., Ltd.
Die and nozzle diameter: φ3mm) and hot air temperature 9
After drying the particulate phosphoric acid medium with a fluidized vibration dryer at 0 ° C. so that the moisture content of the granular phosphoric acid medium is 5% by weight, the mixture is sieved, and 100 L of the 2 to 4 mm granular phosphoric acid medium K of Example 11 is used.
Obtained.

(Examples 12 and 13) The same operation as in Example 11 was repeated, except that the water content after granulation and drying was adjusted to 10% by weight and 30% by weight, respectively. As an example, 100 L of a granular phosphate medium L (Example 12) and a granular phosphate medium M (Example 13) each having a size of 2 to 4 mm were obtained.

(Example 14) The concentration of water-soluble phosphoric acid in a phosphoric acid fertilizer powder containing ku-soluble phosphoric acid as a main component was 0.1% by weight.
The same operation as in Example 11 was repeated except that 1.0% by weight (guaranteed component) was used instead of (guaranteed component), and 2 to 4 mm of the granular phosphate medium N of this example was added to 100% by weight.
L was obtained.

(Example 15) The concentration of water-soluble phosphoric acid in a phosphoric acid fertilizer powder containing ku-soluble phosphoric acid as a main component was 0.1% by weight.
The same operation as in Example 11 was repeated except that 2.0% by weight (guaranteed component) was used instead of the (guaranteed component).
L was obtained.

(Example 16) Phosphoric acid fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphoric acid in powder: 36% by weight (guaranteed component), concentration of water-soluble phosphate: 2.0% by weight
(Guaranteed component), total phosphoric acid concentration; 40% by weight (measured value))
30% by weight, 69.1% by weight of peat moss (moisture content; 10% or less, φ4mm pass, bulk specific gravity: 0.13 g / ml, produced in Canada), ammonia sulfate as a fertilizer for raising seedlings (Nippon Steel Chemical Co., Ltd.) 0.6% by weight, manufactured by Chisso Asahi Fertilizer Co., Ltd., and 0.3% by weight of a guaranteed component (nitrogen concentration; 21% by weight) and a ribbon mixer (model; RM-60, manufactured by Fuji Paudal Co., Ltd.) and mixed with water so that the total water content of the raw materials would be 30% by weight. This mixture is rolled into a disk die roll extrusion granulator (disk pelletizer).
Model: F40 / 33-390, manufactured by Fuji Paudal Co., Ltd.
Die and nozzle diameter: φ3mm) and hot air temperature 9
After drying the particulate phosphoric acid medium with a fluid vibration dryer at 0 ° C. so that the moisture content of the granular phosphoric acid medium is 5% by weight, the mixture is sieved, and 100 L of the 2 to 4 mm granular phosphoric acid medium P of Example 16 is used.
Obtained.

(Example 17) Phosphate fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphoric acid in powder; 36% by weight (guaranteed component), concentration of water-soluble phosphate: 6.0% by weight)
(Guaranteed component), total phosphoric acid concentration; 40% by weight (measured value))
10% by weight, peat moss (moisture content: 10% or less, φ4mm pass, bulk specific gravity: 0.13 g / ml, Canada) 88.8% by weight, ammonia sulfate as a fertilizer for raising seedlings (Nippon Steel Chemical Co., Ltd.) 0.8% by weight, sulfuric acid (manufactured by Chisso Asahi Fertilizer Co., Ltd., guaranteed by elemental concentration: 50% by weight) 0.4% by weight, and a ribbon mixer (model; RM-60, manufactured by Fuji Paudal Co., Ltd.) and mixed with water so that the total water content of the raw materials became 35% by weight. This mixture is rolled into a disk die roll extrusion granulator (disk pelletizer).
Model: F40 / 33-390, manufactured by Fuji Paudal Co., Ltd.
Die and nozzle diameter: φ3mm) and hot air temperature 9
After drying the particulate phosphoric acid medium with a fluidized vibration dryer at 0 ° C. so that the moisture content of the granular phosphoric acid medium is 5% by weight, the mixture is sieved, and 100 L of the 2 to 4 mm granular phosphoric acid medium Q of Example 17 is used.
Obtained.

(Example 18) Phosphoric acid fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphoric acid in powder: 36% by weight (guaranteed component), concentration of water-soluble phosphate: 0.1% by weight)
(Guaranteed component), total phosphoric acid concentration; 40% by weight (measured value))
60% by weight of coir dust (moisture content: 10% by weight)
Below, particle size: 4-6 mm product, bulk specific gravity: 0.11 g / m
1, from Sri Lanka) 20% by weight, peat moss (moisture content: 10% or less, φ4mm pass, bulk specific gravity: 0.13g)
/ Ml, Canadian) 19.3% by weight, 0.50% by weight of ammonium sulfate (manufactured by Nippon Steel Chemical Co., Ltd., guaranteed component nitrogen concentration: 21% by weight) as a fertilizer for raising seedling, Kari sulfate (Chisso Asahi Fertilizer Co., Ltd.) ), Guarantee component Kari concentration; 50% by weight)
25% by weight, and a ribbon mixer (model; RM-6
0, manufactured by Fuji Paudal Co., Ltd.) and mixed with water so that the total water content of the raw materials would be 20% by weight. This mixture was granulated with a disk die roll-type extrusion granulator (disk pelletizer model; F40 / 33-390, manufactured by Fuji Paudal Co., Ltd., die / nozzle diameter: φ3 mm), and hot air temperature was 90 ° C. After drying in a fluidized vibration drier such that the water content of the granular phosphoric acid medium becomes 5% by weight,
The mixture was sieved to obtain 100 L of a granular phosphate medium R having a size of 2 to 4 mm and serving as Example 18.

(Examples 19 and 20) The same operation as in Example 18 was repeated except that the water content after granulation and drying was adjusted to 10% by weight and 30% by weight, respectively. As an example, 100 L of a granular phosphate medium S (Example 19) and a granular phosphate medium T (Example 20) each having a size of 2 to 4 mm were obtained.

(Comparative Example 1) Phosphoric acid fertilizer powder containing citrate-soluble phosphoric acid as a main component (concentration of citrate-soluble phosphate in powder; 36% by weight (guaranteed component), concentration of water-soluble phosphate: 0.1% by weight) (Guaranteed component), total phosphoric acid concentration: 40% by weight (measured value) 50
49.4% by weight of crushed and dried mountain soil of about 200 mesh (aperture: 75 μm), ammonia sulfate (manufactured by Nippon Steel Chemical Co., Ltd., guaranteed component nitrogen concentration: 21% by weight) %) 0.4% by weight, sulfuric acid potassium (manufactured by Chisso Asahi Fertilizer Co., Ltd., guaranteed component potassium concentration; 50% by weight)
0.2% by weight, and add a ribbon mixer (model: RM-
60, manufactured by Fuji Paudal Co., Ltd.) and mixed with water so that the total water content of the raw materials would be 20% by weight. This mixture was subjected to a disc die roll type extrusion granulator (disc pelletizer model; F40 / 33-390,
Die and nozzle diameter: φ3mm, manufactured by Fuji Paudal Co., Ltd.
After drying in a fluid vibration drier having a hot air temperature of 90 ° C. so that the moisture content of the granular phosphoric acid medium becomes 5% by weight, the mixture is sieved. 100 L of granular phosphoric acid U containing mountain soil was obtained.

(Comparative Example 2) The moisture content after granulation and drying was
The same operation as in Comparative Example 1 was repeated, except that the water content was adjusted to 10% by weight, to obtain 100 L of 2 to 4 mm mountain-soiled granular phosphoric acid V of this example.

(Comparative Example 3) This example was obtained using granular cultivation (black grain cultivation) for raising rice seedlings as a medium.

(Comparative Example 4) Phosphate fertilizer particles containing citrate-soluble phosphoric acid as a main component (concentration of phosphate-soluble in powder: 36% by weight, concentration of water-soluble phosphate: 4% by weight or less (guaranteed component)) Was used as a medium to obtain this example.

(Comparative Example 5) Coated nitrogen fertilizer (Kumiai 40
This example was obtained by using the coated urea LP coat 100, nitrogen concentration: 40% by weight (guaranteed component) as a medium.

2. Physical Properties of Granular Phosphoric Acid Medium (Method of Measuring Water Absorption Swelling Ratio) 100 ml of a sample is put into a 500 ml container (bottom area; 100 cm ² ) made of a wire mesh having a bottom of 60 mesh (opening: 0.25 mm ² ). Thoroughly and thoroughly water the top surface. The volume (ml) after water absorption was measured, and ((volume after water absorption−100) / 10
0) From 100, the water absorption expansion coefficient (%) was calculated. (Measurement method of maximum water capacity) According to the Hilgard method, the weight of water absorbed and the weight of dry matter were measured, and the maximum water capacity ((weight of water absorbed) / (weight of dry matter)) × 100 was obtained from (100). %) Was calculated. (Evaluation method for the presence or absence of mold) 200 ml of a sample was placed in a petri dish, and a very small amount of non-sterile peat moss was added for the purpose of adding bacteria mixed with peat moss.
It was stored for 3 months in a constant-temperature and constant-humidity bath of% RH, and the occurrence of mold was checked. Table 1 shows the physical properties of Examples 1 to 20 and Comparative Examples 1 to 5 and the presence or absence of mold.

[0067]

[Table 1]

From Table 1, it can be seen that Examples 1 to 20 belonging to the present invention are shown.
Was found to have a maximum water capacity equal to or greater than that of conventional granular soil for raising rice seedlings, despite containing slow-release phosphate fertilizer. Example 1
No. 20 is smaller and lighter in bulk specific gravity than a conventional granular phosphate medium using a granular soil for paddy rice seedlings and mountain soil, and has a maximum capacity as compared with the soluble phosphate fertilizer particles and the coated nitrogen fertilizer (LP coat). It is clear that the difference in water volume is obvious. In addition, when the moisture content of the granular phosphate medium exceeded 20% by weight, mold was generated.

3. Classification test of granular phosphoric acid medium (Example 21) A 50 L plastic bag was filled with 45 L of the granular phosphoric acid medium A of Example 1 to prepare a sealed specimen, and this specimen was reciprocally shaken (IKEDA) SCIENT
(Manufactured by IFIC) for 2 hours. Then, the plastic bag is opened, and the granular phosphoric acid medium after shaking is seeded in a nursery box (length 28 cm × width 58 cm) in order of 2 L from the top of the plastic bag.
× 3 cm in depth), and a total of 22 seedling raising boxes were filled with a granular phosphate medium to obtain Example 21.

(Examples 22, 23 and 24) Instead of the granular phosphoric acid medium A, the granular phosphoric acid medium D of Example 4 was used.
(Example 22), the granular phosphate medium K of Example 11 (Example 23) or the granular phosphate medium R of Example 18 (Example 2)
This example was obtained by repeating the same operation as in Example 21 except for using 4).

(Comparative Example 6) The same operation as in Example 21 was carried out except that the raw material of the granular phosphate medium of Example 1 was used in powder form instead of the granular phosphate medium A, instead of granulating. This example was obtained repeatedly.

(Comparative Examples 7, 8 and 9) Instead of the raw materials for the granular phosphoric acid medium of Example 1, the raw materials for the granular phosphoric acid medium of Example 4 (Comparative Example 7) and the granular phosphoric acid medium of Example 11 were used. The same operation as in Comparative Example 6 was repeated, except that the raw material for the culture medium (Comparative Example 8) or the raw material for the granular phosphate medium of Example 18 (Comparative Example 9) was used, to obtain this example.

The first, fifth, tenth, fifteenth, and second nursery boxes in Examples 21 to 24 and Comparative Examples 6 to 9 were used.
With respect to the granular phosphate medium filled in the 0th box, the concentration of the total phosphate component was measured. Theoretical value of the total phosphoric acid component concentration contained in the granular phosphoric acid medium in one plastic bag, the first box,
Table 2 shows the measurement results and the standard deviations of the total phosphoric acid component concentrations in the fifth, tenth, fifteenth, and twenty boxes.

[0074]

[Table 2]

From Table 2, it can be seen from Example 21 that the granular phosphoric acid medium belonging to the present invention was used even when the plastic bag was filled with plastic bags and vibrated.
In Nos. To 24, the concentration of the total phosphoric acid component was almost constant between the granular phosphoric acid media in each seedling raising box and did not change and was close to the theoretical value. Therefore, it is clear that classification did not occur.
On the other hand, in Comparative Examples 6 to 9, which were used in powder form without granulation, when filled in plastic bags and vibrated, the concentration of total phosphate components in the powdered phosphate medium in each seedling raising box was reduced. In the first and fifth nursery boxes corresponding to the upper part of the plastic bag, the concentration of the total phosphoric acid component, which is a heavy component, is low (that is, the water retention material, which is a lightweight component, is large). In the 10th to 20th boxes corresponding to the center to the lower part of the bag, the concentration of the total phosphoric acid component is increased, and in the above-described shaking, theoretically, the upper part of the plastic bag is classified in a form containing a large amount of the light component. Therefore, it was found that classification as in theory occurred.

4. Seedling raising test by applying whole amount of fertilizing seedling box (Example 25) 2 L of the granular phosphoric acid medium A of Example 1 was filled in a seedling raising box (length: 28 cm × width: 58 cm × depth: 3 cm), and a conventional soil disinfecting solution was uniformly applied in the painting. Sprayed. On top of this, coated nitrogen and potassium fertilizer (Kumiai paddy rice nursery box whole volume fertilizer dedicated LP coat NK long 301-100, nitrogen concentration;
30% by weight, potash concentration; 10% by weight, guaranteed component) 700
g, and then thoroughly irrigated until the whole becomes saturated. On the seeds, 120 g of seed rice (germinated rice) that has been sufficiently immersed in water and subjected to a germination treatment at 30 ° C.
Further, 1 kg of fertilizer-free granular soil (covering soil) was uniformly placed in the painting, to obtain Example 25.

(Examples 26 to 36) Instead of filling the seedling boxes with the granular phosphate medium A, the granular phosphate medium D of Example 4 (Example 26) and the granular phosphate medium G of Example 7 were used, respectively. Example 27), the granular phosphate medium H of Example 8 (Example 28), and the granular phosphate medium I of Example 9 (Example 2)
9), the granular phosphate medium J of Example 10 (Example 30),
The granular phosphate medium K of Example 11 (Example 31), the granular phosphate medium N of Example 14 (Example 32), the granular phosphate medium O of Example 15 (Example 33), and the granular form of Example 16 Phosphate medium P (Example 34), granular phosphate medium Q of Example 17 (Example 35) or granular phosphate medium R of Example 18
This example was obtained by repeating the same operation as in Example 25 except that (Example 36) was filled.

(Comparative Example 10) A granular phosphate medium A was placed in a nursery box.
Instead of filling, granular soil for paddy rice seedlings (black grain soil,
This example was obtained by repeating the same operation as in Example 25 except that the seedlings (with seedling fertilizer) were filled.

(Comparative Example 11) Nursery box (length 28 cm × width 5)
One liter of granular soil for paddy rice seedlings (black grain soil, containing seedling fertilizer) was filled into an 8 cm × 3 cm depth), and a conventional soil disinfectant solution was evenly sprayed in the painting. On top of this, phosphate fertilizer particles containing citrate-soluble phosphoric acid as the main component (concentration of citrate-soluble phosphate in the particles; 3
700 g of 6% by weight (guaranteed component), water-soluble phosphoric acid concentration: 4% by weight or less (guaranteed component), and coated nitrogen / potassium fertilizer (Kumiai paddy rice seedling box whole volume fertilizer dedicated LP coat NK Long 3)
01-100, nitrogen concentration; 30% by weight, potassium concentration;
(Weight%, guaranteed component) 700 g is uniformly mixed, and water is sufficiently irrigated until the whole is saturated. On top of that, seed rice (germinated rice) 12 which has been sufficiently immersed in water and subjected to a germination treatment at 30 ° C.
0 g was uniformly sown in the image, and 1 kg of fertilizer-free granular soil (covering soil) was uniformly introduced into the image to obtain Comparative Example 11.

The upper portion of the seed rice in each example was covered, and the total weight including the seedling raising box and the water retention per box were measured. For the nursery box of each case, the same practice of raising seedlings was performed, and 35
The seedlings were raised for a day, during which time the germination state of the seed rice and the growth state of the seedlings were visually observed. Table 3 shows the obtained results and the amount of ku-soluble phosphoric acid brought into the nursery box (calculated value).

[0081]

[Table 3]

As shown in Table 3, when the granular phosphate medium of the present invention and the coated nitrogen / potassium fertilizer were applied in total, the total weight of the seedling raising box after watering was the same as the conventional granular soil for paddy rice raising seedling and coated nitrogen / potassium fertilizer. It was found that the weight was lighter and the water retention was equal to or higher than when nitrogen and potassium were all applied using potassium fertilizer. Further, if the concentration is less than 1% by weight of water-soluble phosphoric acid in the granular phosphate medium _{(W-P 2 O 5)} ( Example 25～27,29～32,34～36)
When the germination and growth state was normal, but the water-soluble phosphoric acid concentration was 1% by weight or more (Examples 28 and 33), it was revealed that the germination and growth state was poor. In addition, when the whole amount was fertilized using the conventional granular soil for paddy rice raising seedlings, potassium-soluble phosphate particles, and coated nitrogen / potassium fertilizer (Comparative Example 11).
The seedling box had a poor germination and growth state because the total weight of the nursery box after irrigation was heavy and the amount of water retention was small.

Further, when a slow-release phosphate fertilizer having a water-soluble phosphate concentration higher than 5% by weight (6% by weight) based on the whole slow-release phosphate fertilizer is used, the concentration of the water-soluble phosphate in the medium is reduced. Is less than 1% by weight (Examples 30 and 35), the amount of quosoluble phosphoric acid brought into the nursery box is less than 20%.
-30 g / box was found to be drastically reduced. Therefore, Table 3
According to the results, when a slow-release phosphate fertilizer having a water-soluble phosphate concentration of 5% by weight or less based on the whole slow-release phosphate fertilizer is used, the amount of the lifetime phosphate fertilizer component required for the target crop is large. It has been found that fertilization of a part of the seedlings, and furthermore, fertilizer components of the whole amount can be sufficiently applied at the start of seedling raising.

5. Growth test results of the grown seedlings in Honda (Example 37) The seedlings of Example 25, which were grown for 35 days,
Transplanted to Honda under the condition of 25 boxes per 10 ares (a),
This example was obtained. Nitrogen, phosphoric acid and potassium fertilizer were not applied to the Honda at the time of conventional transplantation, and no additional fertilization was performed.

(Examples 38, 39 and 40) The seedling of Example 26 (Example 38), the seedling of Example 31 (Example 39) or the seedling of Example 36 (Example 40) grown for 35 days was used. ,
The same operation as in Example 37 was repeated, except that transplantation was performed on Honda at 25 boxes per 10 ares (a), respectively.
This example was obtained.

(Comparative Example 12) The seedling of Comparative Example 10 grown for 35 days was transplanted to Honda under conditions of 25 boxes per 10 ares (a). At the time of transplantation, the fertilizer applied to Honda is a fertilizer containing nitrogen, phosphoric acid, and potassium (nitrogen: phosphate: potassium = 12: 18:
14) was used in an amount of 40 kg. That is, 4.8 kg of nitrogen, 7.2 kg of phosphoric acid, and 5.6 k of potassium per 10 ares.
g. When 60 days have passed after transplantation, a fertilizer containing nitrogen and potassium (nitrogen: potassium = 16: 1)
6) was top-fertilized at 10 kg per 10 ares.

For Examples 37 to 40 and Comparative Example 12, the growth status of the rice was 30 days after transplanting (May 22).
Observation was made on the day after and 50 days after, and the day when the ears emerged (heading day) and the day when the rice ears were gathered (earing day) were examined. In addition, the number of ears at the time of harvesting (number / strain) and the yield of brown rice (kg / 10a) were examined.
Table 4 shows the results.

[0088]

[Table 4]

From Table 4, it can be seen that seedlings (Examples 37 to 40) obtained by applying fertilizer in a nursery box to a seedling box using the granular phosphoric acid medium belonging to the present invention and fertilizing and cultivating them (Examples 37 to 40) were obtained by using granular soil for raising rice seedlings. Compared with the seedling cultivated by conventional fertilization (Comparative Example 12),
The growing condition of the rice in Honda was without grandchild.

[0090]

As described above, the granular phosphate medium of the present invention contains a slow-acting phosphate fertilizer and a vegetable fiber material, and is made by granulating these components. Classification due to the difference in the specific gravity of the contained components does not occur with respect to shaking, shaking, etc., and has water absorption characteristics equal to or higher than that of the soil for raising seedlings. Because of its light weight, it is possible to reduce the seeding work at the seedling raising stage, and it is also possible to omit the steps of main fertilizer, additional fertilizer, and ear fertilizer in this field.

In the granular phosphate medium of the present invention,
If the concentration of water-soluble phosphoric acid in the culture medium is reduced to less than 1% by weight, even when a large amount of phosphoric acid component required in this field is applied to the seedling growing container, poor germination and growth may occur during seedling raising. Disappears.

Furthermore, if the above-mentioned granular phosphate medium and a slow-release fertilizer containing a nitrogen fertilizer component and / or a potassium fertilizer component are used in combination, the main three fertilizer components in the seedling raising container, which were conventionally difficult to realize, were used. Even when a large amount of fertilizer is applied, it is possible to apply a slow-acting phosphate fertilizer required for cultivation in this field from cultivation in a nursery container to fertilizer at the seedling stage, and sufficient water retention capacity as a nursery bed And the total weight of the seedling raising container is equal to or less than that when using the conventional nursery soil, which not only can reduce the labor of fertilizing work in this field, but also help reduce the load on the environmental water quality. become.

Claims (10)

[Claims] 1. A granular phosphate medium containing a slow-acting phosphate fertilizer and a vegetable fiber material, wherein these components are granulated. 2. The slow-release phosphate fertilizer contains quorous phosphoric acid as a main component and water-soluble phosphoric acid, and the concentration of the water-soluble phosphoric acid in the granular phosphate medium as a whole is 1
2. The granular phosphate medium according to claim 1, which is less than 10% by weight. 3. The slow-release phosphate fertilizer according to claim 2, wherein the slow-release phosphate fertilizer contains quorous phosphoric acid as a main component and water-soluble phosphate, and the content of the water-soluble phosphate is adjusted to the slow-release phosphate fertilizer. The granular phosphate medium according to claim 1 or 2, wherein the content is 5% by weight or less. 4. The method according to claim 1, wherein the plant fibrous material is coconut shell and / or
The granular phosphate medium according to any one of claims 1 to 3, which is peat moss. 5. The granular phosphate medium according to claim 1, which contains a fast-acting fertilizer required for raising seedlings as a component. 6. The method according to claim 1, wherein the granulation of the components is carried out by granulation by a method capable of applying a shearing force and / or a compressive force. Granular phosphate medium. 7. The method according to claim 1, wherein the water content X is 0% by weight <X ≦ 20% by weight.
A particulate phosphate medium according to any one of the first to third aspects. 8. The granular phosphate medium according to any one of claims 1 to 7, wherein the medium is used after being filled in a seedling raising container. 9. A material for fertilizing a nursery vessel, wherein the granular phosphoric acid medium according to any one of claims 1 to 8 is filled in a nursery vessel, wherein the granular phosphate medium and a nitrogen fertilizer component are provided. And / or a slow-release fertilizer containing a potash fertilizer component. 10. A cultivation method comprising raising a seedling using the granular phosphoric acid medium according to any one of claims 1 to 8 or the material for fertilizing a nursery container according to claim 9.