Preparation method of coated controlled-release compound fertilizer

A compound fertilizer and coating technology, which is applied in the direction of fertilizer mixture, fertilization device, application, etc., can solve the problems of difficult control, low fertilizer supply, and difficult degradation of film materials

Inactive Publication Date: 2014-03-26
陈汇梁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, coated fertilizers with a fertilizer effect period of more than 70 days have disadvantages such as low fertilizer supply in the early stage, which cannot meet the growth needs of crops, difficult fertilization technology, difficult to control, and difficult to degrade the film material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take cornstarch according to 15% by weight of the coating liquid, add water of equal weight percentage, gelatinize under stirring conditions at 90°C, and stir for 30-40 minutes to make a gelatinized product; then take 7% by weight of 1500 molecular weight Polyvinyl alcohol PVA, add 30% by weight of water, dissolve into a solution at 90°C; add polyvinyl alcohol PVA solution to corn starch gelatin, stir in a high-speed mixer for 30 minutes, after cooling, add 0.1% by weight The dicyandiamide powder of 0.01% by weight, the copper sulfate powder of 0.01% by weight, the zinc sulfate powder of 0.01% by weight, the iron sulfate powder of 0.01% by weight, the calcium sulfate powder of 0.02% by weight and 25% by weight The shell powder of % is transferred to the liquid storage tank after high-speed stirring again 10 minutes; The film is also sprayed on the granular fertilizer surface, and the spray thickness weight is 7% of the coated fertilizer weight percent.

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PUM

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Abstract

The invention relates to a preparation method of a coated controlled-release compound fertilizer, which comprises preparation of a coating solution and coating of compound fertilizer granules. The preparation method comprises the following steps: in combination with common granulation equipment, under specific process conditions, synthesizing a fertilizer coating layer by taking degradable high molecular soil conditioner polyvinyl alcohol, natural high molecular starch and fertilizer sustained release agent as main components; and coating a granular compound fertilizer, thus preparing the coated controlled-release fertilizer integrating the functions of simultaneously realizing controlled release of nitrogen, phosphorus and potassium nutrients, having a degradable coating layer, improving soil and the like. The fertilizer efficiency duration is up to 60-100 days; the single-dose application of the fertilizer can satisfy the requirements of crops for nutrients during the whole growing season; and the loss of the fertilizer is effectively decreased, and the utilization ratio of the fertilizer is increased. The coating layer can be biologically degraded within 100 days; and the degraded components are harmless and non-toxic, and effectively improve the soil structure. Besides, the compound fertilizer is accessible in raw materials, simple in processing technique, low in cost and convenient to produce and use.

Description

technical field [0001] The invention relates to a preparation method of coated fertilizer. Background technique [0002] Chemical fertilizers used in agricultural production are prone to leaching, chemical fixation, and volatilization reactions in the soil, resulting in serious loss of fertilizer nutrients, low utilization rate, and serious environmental pollution, soil caking and other consequences. [0003] In order to improve the utilization rate of fertilizers, our technicians develop and produce coated fertilizers. However, at present, coated fertilizers with a fertilizer effect period of more than 70 days have disadvantages such as a small amount of fertilizer in the early stage, which cannot meet the needs of crop growth, difficult fertilization technology, difficult to control, and difficult to degrade the film material. Contents of the invention [0004] The object of the present invention is to provide a coated controlled-release compound fertilizer which has si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 陈汇梁
Owner 陈汇梁
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