Coating fertilizer special for soybean and preparation method for coating fertilizer

A technology for wrapping soybeans, applied in the application, fertilization device, fertilizer mixture, etc., can solve the problems of high cost and refractory degradation, and achieve the effect of reducing production cost, improving yield and quality, and improving protein content and quality.

Active Publication Date: 2012-05-02
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic polymer coated fertilizers generally have the disadvantages of high cost and difficult degradation of coating materials in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] A kind of preparation method of special wrap fertilizer for soybean, comprises the following steps:

[0026] (1) Weigh 150g of polyvinyl alcohol with a molecular weight of 500, slowly dissolve the polyvinyl alcohol in 800g of water under heating and stirring, after the polyvinyl alcohol is completely dissolved, add hydrochloric acid dropwise to adjust the pH of the solution to 1.5;

[0027] (2) Heat the above polyvinyl alcohol solution to 60°C, add dropwise 20g of formaldehyde based on the weight of formaldehyde to the solution, and react for 15 minutes to obtain a condensation product of polyvinyl alcohol and formaldehyde, add ammonia water to adjust its pH to 7.5 , to obtain a transparent liquid;

[0028] (3) Add 60g of 80-mesh phosphorus tailings to the transparent liquid, stir and mix evenly to obtain a spraying liquid;

[0029] (4) The production method of 1000g fertilizer core is: urea 145.9g, monoammonium phosphate 475.5g, potassium chloride 216.7g, sulfur 30.2g...

Embodiment 2

[0032] A kind of preparation method of special wrap fertilizer for soybean, comprises the following steps:

[0033] (1) Weigh 150g of polyvinyl alcohol with a molecular weight of 1300, slowly dissolve the polyvinyl alcohol in 800g of water under heating and stirring, after the polyvinyl alcohol is completely dissolved, add sulfuric acid dropwise to adjust the pH of the solution to 2.0;

[0034] (2) Heat the above polyvinyl alcohol solution to 75°C, add dropwise 40g of formaldehyde solution based on the weight of formaldehyde to the solution, and react for 15 minutes to obtain a condensation product of polyvinyl alcohol and formaldehyde, which is adjusted by adding sodium hydroxide solution Its pH was 7.0 and a clear liquid was obtained.

[0035] (3) Add 270g of 400-mesh phosphorus tailings to the transparent liquid, stir and mix evenly to obtain a spraying liquid;

[0036] (4) The production method of 1000g fertilizer core is: 153.6g of urea, 413.5g of monoammonium phosphate,...

Embodiment 3

[0039] A kind of preparation method of special wrap fertilizer for soybean, comprises the following steps:

[0040] (1) Weigh 150g of polyvinyl alcohol with a molecular weight of 1800, slowly dissolve the polyvinyl alcohol in 800g of water under heating and stirring, after the polyvinyl alcohol is completely dissolved, add nitric acid dropwise to adjust the pH of the solution to 3.5;

[0041](2) Heat the above polyvinyl alcohol solution to 85°C, add dropwise 100g of acetaldehyde solution based on the weight of acetaldehyde to the solution, and react for 25 minutes to obtain a condensation product of polyvinyl alcohol and acetaldehyde, which is then hydrogenated and oxidized Sodium solution adjusted its pH to 8 to obtain a transparent liquid.

[0042] (3) Add 160g of 300-mesh phosphorus tailings to the transparent liquid, stir and mix evenly to obtain a spraying liquid;

[0043] (4) The production method of 1000g fertilizer core is: urea 205.6g, monoammonium phosphate 49...

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PUM

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Abstract

The invention discloses a coating fertilizer special for soybean and a preparation method for the coating fertilizer. The coating fertilizer consists of a fertilizer core and a coating layer, wherein the coating layer comprises a mixture of phosphate tailings and a solution obtained by performing condensation reaction on polyvinyl alcohol and one of formaldehyde, acetaldehyde, propionaldehyde andbutyraldehyde in a weight ratio of 15:(2-10); the phosphate tailings account for 5 to 25 percent of the total weight of the mixture; and the weight of the dried coating layer is 8 to 30 percent of the total weight of the coating fertilizer. The coating fertilizer has high sustained release performance, can fully meet the requirement of the soybean on nutrients, and improves the yield and quality of the soybean.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizers, and specifically relates to a special wrapped fertilizer, and also relates to a preparation method of the special wrapped fertilizer Background technique [0002] Soybean is a major oil crop. Because soybean has its own nitrogen fixation and the soil potassium pool is rich in many areas, traditional soybean fertilization mainly uses phosphorus fertilizer and farmyard manure, and nitrogen and potassium fertilizers are rarely used for many years. As soil fertility declines, this fertilization regime becomes increasingly unreasonable, with the result that both yield and quality of soybeans are affected. Therefore, according to the characteristics of soybean growth requiring fertilizer, develop a fertilizer with comprehensive nutrients, especially complete trace elements, reasonable formula, good slow-release performance, high fertilizer utilization rate, which can fully meet soybean's d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/90
Inventor 胡宏刘旭解田李艳方便张杰张南山杨丽萍
Owner WENGFU (GRP) CO LTD
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