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Long-acting special controlled release fertilizer for corn and preparation method thereof

A technology for corn-specific, controlled-release fertilizers, applied in applications, fertilization devices, fertilizer mixtures, etc., can solve the problems of inability to meet the needs of corn nutrients, complex slow-release fertilizer preparation process, poor adhesion and sealing continuity, etc. Achieve the effects of low cost, lower fertilizer price, and less land occupation for the process

Inactive Publication Date: 2008-05-14
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a special controlled-release fertilizer for long-acting corn and its preparation method. The coating layer of the existing slow-release fertilizer is poor in toughness, brittle, easy to fall off, easy to break, poor in adhesion and sealing continuity technical problems; solve the complex problem of the existing slow-release fertilizer preparation process; and solve the problem that the existing fertilizer components cannot meet the nutritional requirements of corn growth

Method used

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  • Long-acting special controlled release fertilizer for corn and preparation method thereof
  • Long-acting special controlled release fertilizer for corn and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] Embodiment 1: the nitrogen fertilizer in the special controlled-release fertilizer for long-acting corn is urea, ammonium nitrate, ammonium sulfate; Phosphate fertilizer is superphosphate, monoammonium phosphate, diammonium phosphate; Fertilizer zinc sulfate, ferrous sulfate, manganese sulfate, ammonium molybdate, etc. The nutrient ratio is: 4:1:2, and the total nutrient content is 40±1%. The special controlled-release fertilizer for long-acting corn can be prepared by the following steps:

[0030] (1), prefabricated fertilizer core: 127.3kg nutrient content is 12-55-0 powdery monoammonium phosphate, 280.0kg K2O content is 50% potassium sulfate, 250kg powdery urea, 17.2kg additives are put into stirring and mixing In a container, mix well.

[0031] Send the uniformly mixed powdered monoammonium phosphate, potassium sulfate, powdered urea and additives into the granulation drum.

[0032] Melt 325.5kg of urea, spray it into the fertilizer mixture in the granulation cyl...

Embodiment 2

[0038] Embodiment 2: The nutrient ratio is: 2.2:1:1, the total nutrient content is 35±1%, and the long-acting corn-specific controlled-release fertilizer containing the trace element zinc can be prepared by the following steps.

[0039] (1), prefabricated fertilizer core: 100kg nutrient content is the powdered monoammonium phosphate of 12-55-0, the K2O content of 166.70kg is the potassium chloride of 60%, the powder of 128.6kg phosphorus pentoxide content is 35% Heavy superphosphate, 103.0kg of ammonium nitrate with 34% nitrogen content, 65.0kg of ammonium sulfate with 20% nitrogen content, 69.6kg of powdered urea, 41.7kg of zinc sulfate with 24% zinc content, and 25.4kg of additives mixed evenly. The above-mentioned fertilizers that have been mixed evenly are sent into the granulation drum.

[0040] Melt 300.0kg of urea, and use spray granulation process to spray all the melted 300kg of urea into the fertilizer mixture in the granulation tube, and control to achieve a suitabl...

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Abstract

A special controlled-release fertilizer for long-acting corn and its preparation method. The fertilizer core accounts for 80-92% of the total weight of the fertilizer, wherein the weight sum of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer calculated by pure nitrogen, phosphorus pentoxide and potassium chloride is the fertilizer 25%-50% of the total weight, the weight ratio is: 2-4:1-2:1-3; the coating coating accounts for 8-20% of the total weight of the fertilizer, including: 69.5-93% sulfur, 530 % polyethylene wax, 0.5-2% leveling agent. Melt sulfur, add montmorillonite and stir evenly, then add leveling agent, stir evenly to form molten sulfur. The molten sulfur and polyethylene wax are simultaneously sprayed on the surface of the fertilizer core to form a slow-release coating layer. The process occupies less land, requires less investment in equipment, and consumes less energy. It has the characteristics that one fertilization can meet the nutrient needs of corn throughout the growth period. The fertilizer effect is long and safe, and fertilization is simple.

Description

technical field [0001] The invention relates to a slow and controlled release fertilizer and a preparation method thereof, in particular to a special slow and controlled release fertilizer for corn and a preparation method thereof. Background technique [0002] In the prior art, the special fertilizer for corn is formed by mixing elemental chemical fertilizers containing nitrogen, phosphorus and potassium and micro-fertilizers according to a certain ratio. Nitrogen fertilizers used in fertilizer materials such as urea, ammonium chloride, ammonium sulfate, ammonium bicarbonate, etc., are prone to ammonia volatilization loss after application on calcareous soil. At the same time, after being converted into nitrate nitrogen by nitrifying bacteria in the soil , it is easier to leaching and loss; and the phosphorus in the fertilizer is also easier to combine with calcium, magnesium, iron and aluminum in the soil to grow insoluble precipitation; potassium is easy to be fixed by 2:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G1/00
Inventor 史衍玺杨守祥董树亭王空军董元杰孔凡美
Owner SHANDONG AGRICULTURAL UNIVERSITY
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