CN104303801A - Cultivation method of oil-tea camelia dwarfing multi-branch seedlings - Google Patents

Abstract

The invention discloses a method for cultivating dwarfed multi-branch seedlings of camellia oleifera, belonging to the technical field of agricultural planting. It adopts the conventional grafting seedling raising method to cultivate camellia oleifera seedlings first, and after the seedlings grow into the 2nd instar stage, the seedlings are respectively thinned out before germination in spring and after semi-lignification in spring; Prune three times to control height after cessation of growth and semi-lignification period in autumn; topdress respectively in spring germination period, summer shoot germination period and early autumn sprouting period; strengthen drainage work in rainy seasons, and timely irrigate in dry seasons. Cultivate until the end of the 2nd instar stage to carry out afforestation and transplanting. The seedlings cultivated by the invention have the advantages of dwarfing, robustness and multi-branching, and the qualified rate of the seedlings coming out of the nursery is relatively high.

Description

A kind of cultivation method of Camellia oleifera dwarf multi-branched seedlings

technical field

The invention relates to the technical field of agricultural planting, in particular to a method for cultivating dwarfed multi-branched seedlings of camellia oleifera.

Background technique

Camellia oleifera, also known as camellia oleifera, camellia oleifera and white flower tea, is the main woody edible oil tree species in my country. Accelerating the development of camellia oleifera industry is a strategic measure to improve the structure of people's edible oil and maintain the national oil security. In 2009, the three ministries and commissions of the country issued the "National Camellia Camellia Industry Development Plan (2009-2020)", which proposed a development target of more than 40 kilograms of oil per mu in new Camellia oleifera forests, which is about 5kg higher than that of existing low-yielding forests. More than 35kg, this goal puts forward higher requirements for the selection of Camellia oleifera varieties and the quality of seedlings. Seedlings are the basic material for the industrialization of camellia oleifera, and the quality of seedlings is the key to the industrialization of camellia oleifera.

At present, China has promulgated two industry standards and national standards in terms of seedlings: "Camellia oleifera Seedling Technology and Quality Classification LY/T1730.3-2008" and "Camellia Camellia Seedling Quality Classification GB/T26907-2011"; Camellia oleifera Seedling Development and Strengthening Seedling Quality Management Notice (Linchangfa [2008] No. 213), under the support and guidance of the national camellia oleifera industry policy, all provinces (districts) of the Camellia oleifera industry in China have established ear picking nurseries and breeding Base, seedling cultivation has achieved industrialization, but seedling cultivation is still based on quantity, the quality of seedlings is low, and the quality of seedlings still restricts the healthy development of the local camellia oleifera industry.

Camellia oleifera seedlings are cultivated mainly in three ways: light substrate nutrition bag seedling cultivation, bare root seedling cultivation and bare root seedling nutrition bag transplantation. The light substrate nutrition bag seedling cultivation method is to transplant the grafted bud stock seedlings into the prepared light substrate nutrition bag to complete the seedling cultivation process; the bare root seedling nutrition bag cultivation method is to transplant the seedlings into the field after 0.5-1.5 intensive cultivation in the field The process of cultivating in nutrient bags to afforestation out of the nursery; the bare-root seedling cultivation method is the process of directly transplanting the grafted bud stock seedlings into the field to cultivate them out of the nursery. At present, the proportion of bare-root seedling cultivation still dominates. In order to reduce costs, the producers of Camellia oleifera seedlings have high initial planting density and low scientific management level. The seedling yield per mu is as high as 50,000. The range is mostly 10-100cm, and the seedlings with weak growth potential are in the shade for a long time, resulting in a large number of seedlings weakening, the branching rate is extremely low, the proportion of single-stem seedlings is as high as 60%, and the qualified rate of seedlings out of the nursery is less than 70%. Affected by the uncertainty of the germination of a large number of single-rod seedlings, the terminal buds germinate quickly, the growth potential is strong, and the height of the branches moves up. Significant differences in structural differentiation.

Through searching on the Internet, there are many patent applications on the cultivation of Camellia oleifera seedlings. Among them, the patent application No. 201210438964.5 discloses "a method for cultivating high-quality Camellia oleifera seedlings", which adopts two-stage seedling cultivation. , starting from the preparation of the seedling soil, respectively prepare the seed development soil and the seedling cultivation soil suitable for the growth of camellia seedlings and large seedlings of camellia oleifera, and allow the seedlings of camellia oleifera and transplanted seedlings of camellia oleifera to develop and grow in the seed development soil and the cultivation soil of large seedlings respectively . The cultivated Camellia oleifera seedlings have high transplanting survival rate, short production cycle and high yield. However, the seedlings still have technical problems such as low branching rate, low qualified rate of nursery stock, and obvious differences in tree structure differentiation.

Contents of the invention

In view of this, the purpose of this invention is to provide a kind of cultivation method of camellia oleifera dwarf multi-branched seedlings, to solve the problem that the branching rate of seedlings cultivated in the prior art is extremely low, and the seedlings with weak growth potential are in shaded state for a long time, causing a large number of The seedlings are weakened, the proportion of single-stem seedlings is high, the qualified rate of nursery stock is low, and there are generally technical problems such as partial crown lodging, disordered crown shape, irregular forest phase, and obvious differences in tree structure differentiation after afforestation.

The present invention solves the above technical problems through the following technical solutions:

A method for cultivating Camellia oleifera dwarf multi-branched seedlings, comprising the steps of:

(1) Density control: adopt the conventional grafting seedling raising method to cultivate Camellia oleifera seedlings. After the seedlings grow into the 2nd instar stage, carry out the first seedling thinning before the spring germinates, that is, pull out the plants that have not germinated and are damaged by diseases and insect pests; when the seedlings enter the spring halfway After lignification, the second thinning is carried out, and the dense weak plants, diseased plants, mechanically damaged plants and oblique plants are pulled out, and the growth space of a single seedling is 0.02-0.025m ² , and the plant spacing is 15-17cm;

(2) Pruning and controlling height: the Camellia oleifera seedlings of 2 ages are divided into three times and pruned, the first pruning is carried out in the slightly semi-lignified period in spring, and the height of pruning to the seedlings is 20-25cm; the second pruning is in summer Carry out after slightly stopping growth, pruning to the height of seedlings is 30-35cm; The third pruning is to carry out in the semi-lignification stage in autumn, and pruning to the height of seedlings is 40-45cm;

(3) Fertilization management: the above-mentioned 2-year-old seedlings are fertilized 3 times, and the first fertilization is at the germination stage in spring, and the quick-acting nitrogen fertilizer is used, and the amount of fertilizer is 8-10kg/mu; Carry out in the lignification period, apply quick-acting nitrogen fertilizer, and the fertilizer amount is 10-12kg/mu; the third fertilization is carried out in the early stage of autumn sprouting, and apply compound fertilizer 14-16kg/mu;

(4) Water management: the above-mentioned 2-year-old seedlings, in rainy seasons and prone to floods, strengthen the work of clearing ditches and drainage in the nursery, and irrigate in a timely manner in the dry season, and transplant the seedlings until the end of the 2-year-old seedlings.

Preferably, in the step (1), after the second seedling thinning, ensure that the growth space of a single seedling is 0.023m ² , and the spacing between the plants is 16cm.

Preferably, in described step (2), the height control of seedlings after pruning for the first time is 22cm, the height of control seedlings after pruning for the second time is 33cm, and the height of control seedlings after pruning for the third time is 42cm.

Preferably, the quick-acting nitrogen fertilizer is urea.

Further, in the described step (3), the method of fertilizing for the third time is topdressing in a double row single ditch, the ditch depth is 8-10cm, and the width is 6-8cm. After the fertilizer is evenly sprinkled into the ditch, the soil cover ditch is backfilled, and in time Diversion irrigation.

Preferably, the nitrogen content in the compound fertilizer is 15%, the phosphorus pentoxide content is 15%, and the potassium oxide content is 15%.

Preferably, in the step (4), the relative humidity of the soil is controlled to be 50-60%.

The beneficial effects of the present invention are:

First of all, in the cultivation of forest tree seedlings, the greater the density of seedlings, the higher the degree of weakening of the seedlings, and the lower the density, the more high-quality strong seedlings can be cultivated. Therefore, reasonable control of seedling density is the key to cultivating more and better quality seedlings. The invention regulates the density of seedlings by thinning the nursery, and adjusts the original yield of 50,000 plants per mu to a reasonable density of 18,000 to 20,000 plants per mu, so that more and better quality seedlings can be cultivated.

Secondly, due to the unbalanced development of buds in the spikes of common grafted seedlings, the development of the upper buds is strong and the germination ability is strong, while the development of the basal buds is weak and the germination is slow, resulting in uneven growth of seedlings after grafting and large differences in tree structure differentiation. . The present invention controls the height of seedlings at the 2nd age stage by pruning three times, effectively reducing the difference in growth and differentiation of seedlings, promoting the branching of seedlings, and cultivating dwarf, robust and multi-branched high-quality Camellia oleifera seedlings, so as to obtain early fruit and high yield in the later stage Camellia oleifera forest lays a solid foundation.

Thirdly, the present invention ensures the nutrient supply of the seedlings and enables the seedlings to grow vegetatively for a long time by performing scientific fertilization management and effectively regulating the humidity of the seedbed soil. Further make the cultivated seedlings grow robustly, and further improve the pass rate of seedlings out of the nursery.

Finally, the process of the present invention is simple, the production cost is relatively low, and it is suitable for large-scale production.

Beneficial effect of the present invention is verified by test example below:

Test example one

The present invention implements secondary density control and tertiary height control pruning technology application in the growth stage of camellia seedlings, and performs a contrastive test with the implementation of secondary density control only secondary height control pruning and no treatment. The timing of density control is implemented before spring shoot germination and after semi-lignification; the third height control pruning is to implement fixed-dry dwarfing and short-cutting for semi-lignified to lignified spring shoots, summer shoots, and autumn shoots, and the control heights are 20 -25cm, 30-35cm and 40-45cm; the second height control pruning is to implement fixed-dry dwarfing and short-cutting on semi-lignified to lignified summer shoots and autumn shoots, and the control heights are 30-35cm and 40-45cm respectively; The control without treatment was not arranged to implement thinning and height control pruning. The results are shown in Table 1 below after investigation on fixed plots (2m ² /plot).

Table 1

According to the survey results: ①The density of seedlings is controlled at 50-60 plants/m ² , and the qualified rate of Grade II and above is over 90%, which is 30% higher than that of the control group. ②The branching rate reached 89% after the third high-tech treatment, which was 18.4 percentage points higher than the second high-tech treatment and 43.5 percentage points higher than the control group; 4 percentage points higher, 35.1 percentage points higher than the control group. ③The branching rate after secondary high-tech treatment was 70.6%, 25.1 percentage points higher than that of the control group; the pass rate of Grade II and above was 90.6%, 31.1 percentage points higher than that of the control group.

The results proved that: when the density control and height control pruning were carried out during the growth period of camellia oleifera seedlings, the quality and branching rate of the seedlings were significantly different from those of the control; the summer and autumn shoots of 2-year-old camellia seedlings had a certain tillering ability, but the spring shoots were shortened by height control. After dwarfing pruning, the tillering and branching ability was the strongest, and the branching rate was the highest after three times of height control pruning.

Test example two

A total of three varieties of Xianglin 210, Xianglin 56 and Xianglin 27 were carried out three times for height control and pruning comparison experiments, and the results are shown in Table 2 below.

Table 2

According to the survey results: the branching rate of the 3 varieties was significantly increased after pruning with height control, among which the branching rate of Xianglin 56 control group 2 was only 41.7%, which was a variety with low natural branching ability. The rate increased to 86.4%, which was 44.7 percentage points higher than that of the control group 2. It proved that the branching rate of Camellia oleifera seedlings is closely related to the natural branching ability of each variety, but the difference in branching rate is very significant after the height-controlled pruning of varieties with low natural branching rate.

Test example three

The 2-year-old seedlings treated with the height-controlled pruning technology were compared with the untreated seedlings of the same age and 3-year-old seedlings for afforestation, and the fixed sample plot (400m ² ) was investigated. The results are shown in Table 3 below.

table 3

According to the survey results: ① The survival rate of the controlled high-pruned seedlings reached 100%, which was 23.3% and 5.7% higher than that of the same age and 3-year-old untreated seedlings respectively. ②The number of branches of the 2-year-old young forest planted by height-controlled pruning reached 32, which were 24 and 17 more than those of the same age and 3-year-old untreated seedlings, respectively. ③The canopy width of the 2-year-old young forest planted by height-controlled pruning reached 0.137m ² , which was 0.096m ² and 0.051m ² higher than that of the same age and 3-year-old untreated seedlings.

The results proved that the survival rate and growth volume of pruned seedlings with controlled height were significantly higher than those of the same age and 3-year-old untreated seedlings.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments. The embodiment is only an illustration of the invention, not a limitation of the invention. The steps not specifically described in the embodiment are all prior art, and will not be described in detail here.

Embodiment one

A method for cultivating Camellia oleifera dwarf multi-branched seedlings, comprising the steps of:

(1) Density control: adopt the conventional grafting seedling raising method to cultivate Camellia oleifera seedlings. After the seedlings grow into the 2nd instar stage, carry out the first seedling thinning before the spring germinates, that is, pull out the plants that have not germinated and are damaged by diseases and insect pests; when the seedlings enter the spring halfway After lignification, carry out the second thinning, remove dense weak plants, diseased plants, mechanically damaged plants and oblique plants, and ensure that the growth space of a single seedling is 0.02m ² , the distance between plants is 15cm, and the yield of seedlings per mu is 20,000 ;

(2) Pruning and height control: pruning the Camellia oleifera seedlings of the 2nd age in three times, there are no obvious growth nodes in spring and summer, and the summer growth period is the critical period for sprouting and tillering branches, so the first pruning is in spring Slightly half lignification stage is carried out, and pruning is 20cm to the height of seedling; The second pruning is to carry out after stopping growth slightly in summer, and the height of pruning to seedling stock is 30cm; Trimming to the height of the seedlings is 40cm;

(3) Fertilization management: the above-mentioned 2-age seedlings are fertilized 3 times, and the first time of fertilization is at the spring germination stage in early March, urea is evenly spread on the seedbed, and shallow hoe loose soil and cover fertilizer, and then Water to dissolve urea, and the amount of fertilizer used is 8kg/mu; the second fertilization is carried out in the spring lignification period, urea is evenly sprinkled on the seedbed, and the soil is loosened in time, and watering promotes the dissolution of urea to form seedlings. To provide nutrition, the amount of fertilizer used is 10kg/mu; the third fertilization is the key to strong seedlings, and it is carried out in the early stage of autumn germination, and the nitrogen content is 15%, the phosphorus pentoxide content is 15%, and the potassium oxide content is 15%. The method of fertilizing is topdressing in two rows and single ditch, with a ditch depth of 8 cm and a width of 6 cm. After evenly spreading the fertilizer into the ditch, backfill the ditch, and divert water for irrigation in time. The amount of fertilizer used is 14kg/mu;

(4) Water management: Camellia oleifera is a light-loving tree species, but it is afraid of floods and droughts in its infancy. Strengthening water management at the seedling stage is one of the main technical measures for cultivating high-quality and strong seedlings. Rotten, the roots rot in the later stage, the seedlings continue to yellow, the leaf buds shrivel and fall off into bare stem seedlings, and in severe cases, they die in pieces; long-term drought directly inhibits the vegetative growth of Camellia oleifera seedlings, and the burnt area of the leaves rapidly expands and falls off after dehydration, and the young shoots first dry up , until the pieces die. Therefore, for the above-mentioned 2-year-old seedlings, in rainy and flood-prone seasons, strengthen the clearing and drainage work of the nursery, irrigate in a timely manner in the dry season, and control the relative humidity of the soil on the seedbed to 50-60%. Transplanting can be carried out at the end of the period.

Using the method of this example to cultivate Camellia oleifera seedlings of Xianglin 210 variety, the pass rate of Grade II and above was 95.6%, the branching rate was 95.3%, and the transplanting survival rate was 100%.

Embodiment two

A method for cultivating Camellia oleifera dwarf multi-branched seedlings, comprising the steps of:

(1) Density control: adopt the conventional grafting seedling raising method to cultivate Camellia oleifera seedlings. After the seedlings grow into the 2nd instar stage, carry out the first seedling thinning before the spring germinates, that is, pull out the plants that have not germinated and are damaged by diseases and insect pests; when the seedlings enter the spring halfway After lignification, carry out the second thinning, remove dense weak plants, diseased plants, mechanically damaged plants and oblique plants, and ensure that the growth space of a single seedling is 0.025m ² , the distance between plants is 17cm, and the yield of seedlings per mu is 18,000 ;

(2) Pruning and height control: pruning the Camellia oleifera seedlings of the 2nd age in three times, there are no obvious growth nodes in spring and summer, and the summer growth period is the critical period for sprouting and tillering branches, so the first pruning is in spring Slightly half lignification stage is carried out, and pruning is 25cm to the height of seedling; The second pruning is to carry out after stopping growth slightly in summer, and pruning is 35cm to the height of seedling; Trimming to the height of seedlings is 45cm;

(3) Fertilization management: the above-mentioned 2-age seedlings are fertilized 3 times, and the first time of fertilization is at the spring germination stage in early March, urea is evenly spread on the seedbed, and shallow hoe loose soil and cover fertilizer, and then Water to dissolve urea, and the amount of fertilizer used is 10kg/mu; the second fertilization is carried out in the spring lignification period, urea is evenly spread on the seedbed, and the soil is loosened in time, and watering promotes the dissolution of urea for seedlings. To provide nutrition, the amount of fertilizer used is 12kg/mu; the third fertilization is the key to strong seedlings, and it is carried out in the early stage of autumn germination, and the nitrogen content is 15%, the phosphorus pentoxide content is 15%, and the potassium oxide content is 15%. The method of fertilizing is topdressing in two rows and single ditch, the ditch is 10cm deep and 8cm wide, and the fertilizer is evenly sprinkled into the ditch, backfilled with soil to cover the ditch, and water is diverted in time for irrigation. The amount of fertilizer used is 16kg/mu;

(4) Water management: Camellia oleifera is a light-loving tree species, but it is afraid of floods and droughts in its infancy. Strengthening water management at the seedling stage is one of the main technical measures for cultivating high-quality and strong seedlings. Rotten, the roots rot in the later stage, the seedlings continue to yellow, the leaf buds shrivel and fall off into bare stem seedlings, and in severe cases, they die in pieces; long-term drought directly inhibits the vegetative growth of Camellia oleifera seedlings, and the burnt area of the leaves rapidly expands and falls off after dehydration, and the young shoots first dry up , until the pieces die. Therefore, for the above-mentioned 2-year-old seedlings, in rainy and flood-prone seasons, strengthen the clearing and drainage work of the nursery, irrigate in a timely manner in the dry season, and control the relative humidity of the soil on the seedbed to 50-60%. Transplanting can be carried out at the end of the period.

Using the method of this example to cultivate Camellia oleifera seedlings of Xianglin 56 species, the pass rate of Grade II and above was 98.7%, the branching rate was 85.9%, and the transplanting survival rate was 100%.

Embodiment three

A method for cultivating Camellia oleifera dwarf multi-branched seedlings, comprising the steps of:

(1) Density control: adopt the conventional grafting seedling raising method to cultivate Camellia oleifera seedlings. After the seedlings grow into the 2nd instar stage, carry out the first seedling thinning before the spring germinates, that is, pull out the plants that have not germinated and are damaged by diseases and insect pests; when the seedlings enter the spring halfway After lignification, carry out the second thinning, remove dense weak plants, diseased plants, mechanically damaged plants and oblique plants, and ensure that the growth space of a single seedling is 0.023m ² , the distance between plants is 16cm, and the yield of seedlings per mu is 19,000 ;

(2) Pruning and height control: pruning the Camellia oleifera seedlings of the 2nd age in three times, there are no obvious growth nodes in spring and summer, and the summer growth period is the critical period for sprouting and tillering branches, so the first pruning is in spring Carry out slightly half lignification period, pruning to the height of seedling stock is 22cm; The second pruning is to carry out after stopping growth slightly in summer, and the height of pruning to seedling stock is 33cm; Trimmed to the height of seedlings is 42cm;

(3) Fertilization management: the above-mentioned 2-age seedlings are fertilized 3 times, and the first time of fertilization is at the spring germination stage in early March, urea is evenly spread on the seedbed, and shallow hoe loose soil and cover fertilizer, and then Water to dissolve urea, and the amount of fertilizer used is 9kg/mu; the second fertilization is carried out in the spring lignification period, urea is evenly sprinkled on the seedbed, and the soil is loosened in time, and watering promotes the dissolution of urea to form seedlings. To provide nutrition, the amount of fertilizer used is 11kg/mu; the third fertilization is the key to strong seedlings, and it is carried out in the early stage of autumn germination, and the nitrogen content is 15%, the phosphorus pentoxide content is 15%, and the potassium oxide content is 15%. The method of fertilizing is topdressing in two rows and single ditch, the ditch is 8cm deep and 6cm wide, and the fertilizer is evenly sprinkled into the ditch and backfilled with soil to cover the ditch, and water is diverted in time for irrigation. The amount of fertilizer used is 15kg/mu;

(4) Water management: Camellia oleifera is a light-loving tree species, but it is afraid of floods and droughts in its infancy. Strengthening water management at the seedling stage is one of the main technical measures for cultivating high-quality and strong seedlings. Rotten, the roots rot in the later stage, the seedlings continue to yellow, the leaf buds shrivel and fall off into bare stem seedlings, and in severe cases, they die in pieces; long-term drought directly inhibits the vegetative growth of Camellia oleifera seedlings, and the burnt area of the leaves rapidly expands and falls off after dehydration, and the young shoots first dry up , until the pieces die. Therefore, for the above-mentioned 2-year-old seedlings, in rainy seasons that are prone to floods, strengthen the clearing and drainage work of the nursery, and irrigate in a timely manner in the dry season, and control the relative humidity of the soil on the seedbed to 55-58%. Transplanting can be carried out at the end of the period.

Using the method of this example to cultivate Camellia oleifera seedlings of Xianglin 27 varieties, the pass rate of Grade II and above was 95.4%, the branching rate was 99.1%, and the transplanting survival rate was 100%.

Claims (7)

1. oil tea downgrades a breeding method for multi-branched nursery stock, it is characterized in that, comprises the steps:

(1) density adjusting: adopt conventional grafting seedlings-growing method to cultivate oil tea nursery stock, enter after 2 length of times until Growth of Camellia oleifera, carry out first time thinning before the spring slightly sprouts, namely pull out the plant of non-rudiment and damage by disease and insect; Enter the spring until nursery stock and slightly carry out second time thinning after semi-lignified, by close weak strain, sick worm strain, mechanical damage strain and tiltedly raw strain pull out, and guarantee that individual plant seedling growth space is 0.02-0.025m ², strain spacing is 15-17cm;

(2) prune control high: divided by the oil tea nursery stock in 2 length of times and prune for three times, in the spring, slightly the semi-lignified phase carries out in first time pruning, and the height being trimmed to nursery stock is 20-25cm; Second time is pruned and is carried out after the summer slightly stops growing, and the height being trimmed to nursery stock is 30-35cm; In the autumn, slightly the semi-lignified phase carries out in third time pruning, and the height being trimmed to nursery stock is 40-45cm;

(3) fertilizing management: to above-mentioned 2 the length of time nursery stock carry out 3 times fertilising, first time fertilising at spring slightly sprouting period, use instant nitrogenousfertilizer, fertilizer application amount is 8-10kg/ mu; In the spring, slightly the lignification phase carries out in second time fertilising, and use instant nitrogenousfertilizer, fertilizer application amount is 10-12kg/ mu; Third time fertilising is slightly sprouted in the autumn and is carried out early stage, uses composite fertilizer 14-16kg/ mu;

(4) water management: above-mentioned 2 the length of time nursery stock, in the rainy easy generation flood time, strengthen the ditch cleaning water drainage work in nursery, irrigate at arid season in good time, treat that cultivating seedlings to 2 terminates to transplant the length of time.

2. oil tea as claimed in claim 1 downgrades the breeding method of multi-branched nursery stock, it is characterized in that, in described step (1), after carrying out second time thinning, guarantees that individual plant seedling growth space is 0.023m ², strain spacing is 16cm.

3. oil tea as claimed in claim 1 downgrades the breeding method of multi-branched nursery stock, it is characterized in that, in described step (2), the Altitude control that first time prunes rear nursery stock is 22cm, second time controls nursery stock height after pruning is 33cm, and the height controlling nursery stock after pruning for the third time is 42cm.

4. oil tea as claimed in claim 1 downgrades the breeding method of multi-branched nursery stock, and it is characterized in that, described instant nitrogenousfertilizer is urea.

5. oil tea as claimed in claim 1 downgrades the breeding method of multi-branched nursery stock, it is characterized in that, in described step (3), the method that third time applies fertilizer is that duplicate rows list ditch imposes, ditch depth 8-10cm, wide 6-8cm, fertilizer is evenly sprinkled into backfill earth mulch ditch after in ditch, and timely diversion irrigation.

6. oil tea as claimed in claim 1 downgrades the breeding method of multi-branched nursery stock, and it is characterized in that, in described composite fertilizer, nitrogen content is 15%, and phosphorus pentoxide content is for being 15%, and potassium oxide content is 15%.

7. oil tea as claimed in claim 1 downgrades the breeding method of multi-branched nursery stock, it is characterized in that, in described step (4), the relative moisture controlling soil is 50-60%.