Preparation method of mechanically fertilized controlled-release fertilizer special for winter wheat

Abstract

The invention relates to a preparation method of mechanically fertilized controlled-release fertilizer special for winter wheat. The preparation method comprises the following steps: taking urea, monoammonium phosphate, potassium chloride and zinc sulfate according to the proportion, granulating by a high tower to obtain granular core fertilizer; spraying urea solution onto the core fertilizer to form a urea film to obtain urea-coated fertilizer; taking epoxy resin and polyurethane, and adding curing agent T31, diluting agent benzyl glycidyl ether and talcum powder, mixing uniformly to obtain an outer film coating agent; spraying the outer film coating agent onto the urea-coated fertilizer to obtain three double-layer coated controlled-release fertilizer varieties I, II and III with the dosage of the outer film coating agent respectively occupying 3%, 5% and 7% of the urea-coated fertilizer; and further compounding according to the proportion to obtain the controlled-release fertilizer. The preparation method provided by the invention prepares the core fertilizer special for the wheat according to absorption requirements of the winter wheat on nutrition such as nitrogen, phosphorus, potassium and zinc; and then the double-layer coating is adopted, wherein an inner film improves surface characteristics of the fertilizer granules, and an outer film controls the nutrition release, so that controlled-release fertilizer is suitable for the nutrition absorption of the winter wheat and is suitable for mechanical fertilization.

Description

technical field

[0001] The invention relates to a preparation method of a special controlled-release fertilizer for winter wheat suitable for mechanical application, and belongs to the technical field of fertilizer production and application. Background technique

[0002] In my country, wheat is the main food crop second only to rice, with a sown area of ​​354.26 million mu, accounting for 20-27% of the total area of ​​food crops, with a total output of 112.46 million kilograms. At present, there is a serious shortage of labor force in rural areas in our country. Field management in wheat planting areas mainly depends on the elderly and women. It is urgent to realize the mechanization of operations such as sowing, harvesting, and fertilization. In fact, wheat production is one of the crops with the highest degree of mechanization, but the fertilizer varieties suitable for it cannot meet the demand, especially the controlled release fertilizer specially used for mechanical ap...

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