PL77235B1 - - Google Patents

Description

Peat-mineral compost. The invention relates to peat-mineral compost for harvesting. Composts from which the clay has been substantially eliminated are known, however in many cases it has become necessary to add fertilizers with traces of chemical elements to the compost, which should normally be provided by clay. Behavior of trace elements in clay, or in a composite without the addition of clay, it is completely different. The action of clay on essential trace elements is very complex, but one of the properties of clay is its ability to "lock" trace elements. This "locking" allows the use of relatively high doses of certain trace elements without compromising on foot traffic. the toxic level of the clay mineral. Moreover, clays are generally used in open spaces and rain or water acts on them to dissolve or wash away trace elements. On the other hand, the composts with no clay admixture do not block the trace elements, and since they are generally used in confined spaces, the concentration of the trace elements must be carefully controlled to prevent concentration toxic to the plant from being reached. In the absence of boron in composts, practice has been made to add boron in the form of corax. However, it has been found that borax is not a completely suitable source of boron and that better plant growth can be obtained if borax is replaced with a relatively insoluble source of boron. or if a chemical reaction transforms borax into a relatively insoluble source of boron in the compost. It is possible, of course, to add a sufficient amount of boron to a compost that does not contain clay as soluble boron compounds, but there is a serious contraindication to this method, namely the content of boron in water varies greatly in different environments and may be between 0 and 0.1 ppm. At higher concentrations, accumulation of boron in clay-free compositions in confined spaces can easily reach toxicity limits. The invention solved the problem of the limits of boron toxicity in clay-free composts by using specific boron compounds. which provides a plant growth medium that is substantially clay free, and a relatively insoluble salt having boron in the anion, which salt is not toxic to plants when used in the proper concentration. In water, a boron-containing salt is understood to mean a salt whose solubility is considerably lower than that of borax. Examples of such salts that can be used in the composition of the invention are calcium tetraborate, calcium borate, manganese borate and the like. The boron-containing salt is preferably used in amounts such as to give 1 to 100 parts by weight of boron per million parts by weight of the compost on a dry weight basis. Compost is preferably used according to the invention as a plant growth medium, or as part of it. The environment contains peat. Other raw materials that may be used as growth environments for the growth of peat or peat additive are sand, vermiculite, perlite, artificial raw materials such as polystyrene and the like, and mixtures thereof. The compost according to the invention preferably contains , also the fertilizing substrate, which will usually contain nutrients such as nitrogen, potassium and phosphorus including traces of elements such as iron, copper, molybdenum, magnesium and the like. Typical additives are potassium salts such as potassium nitrate, sulfate potassium, potassium chloride, etc., phosphates such as superphosphates, for example triple superphosphate, monoammonium phosphate, potassium metaphosphate and the like, ammonium salts such as ammonium nitrate, ammonium sulfate and the like, and organic raw materials containing nitrogen, such as low molecular weight decomposable urea-formaldehyde resin, hooves and horns, dry blood, and the like. If necessary, compost can be c An added limestone as part of the fertilizer substrate, or an inert or carrier material such as sand may be used. The amount of limestone or inert or carrier stone used is small compared to, for example, peat and is usually less than 5% of its weight. The amount of fertilizer is preferably such as to obtain 10-10,000 parts of nitrogen as N per million. parts by weight of compost on a dry basis, 50-10,000 parts of potassium as K20 per million parts by weight of compost on a dry basis, and 30-10,000 parts of phosphorus as P205 per million parts by weight of compost on a dry basis mass. The following example explains the invention. Example. Peat (sphagnum moss peat), ground, with a moisture content of 30-35% by weight and following sieve analysis: 100% by 0.95 cm, 10 15 35 45 91% by 0.64 cm, 83% by 0. 48 cm, 67% through a No. 5 BSS sieve, 17% through a No. 30 BSS sieve, and 0-5% through a No. 60 BSS sieve, were mixed with three types of substrate having the following composition. limestone Borax Calcium tetraborate Manganese borate A% 3.93 4.16 4.28 0.87 0.07 66.00 0.37 - - B% 3.93 4.16 4.28 0.87 0.07 66, 00; - 0.02 - c% 3.93 4.16 4.28 0.87 0.07 66.00 - - 0.02 Eurocross BE tomatoes grew in each type of compost, and after 4 weeks the above-ground parts of the plants were cut and dry weight was determined. The following results were obtained. . PL PL

Claims (3)

1. Claims 1. Peat-mineral compost containing a clay-free plant growth environment and an addition of a boron compound, characterized in that the boron compound is a salt having boron in the anion, such as calcium tetraborate, calcium borate or manganese borate in such amount to make the boron content 1 to 100 parts by weight of boron per million parts by weight of compost on a dry weight basis. 2. Compost according to claim The process of claim 1, wherein the plant growth environment is peat. 3. Compost according to claim The method of claim 1, wherein the plant growth environment comprises at least sand, vermiculite, perlite or polystyrene as one of the raw materials. Zaklady Typograficzne Lódz, residing in 95/75 - 100 copies. Price 10 al PL PL