Release controlling fertilizer and its prepn

A controlled-release fertilizer and a new type of technology, applied in the field of new-type controlled-release fertilizers and their preparation, can solve the problems of changes in nutrient release rules and poor slow-release effect, and achieve the effects of improving utilization rate, reducing loss and achieving good controlled-release effect.

Inactive Publication Date: 2003-05-14
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its nutrient release law often changes with the variation of soil environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 coats the long-acting urea of ​​acrylic resin

[0021] Use urea and urease inhibitor N-butylthiophosphoric triamide (NBPT) as the fertilizer core, the applicable soil is acidic or slightly acidic soil, NBPT is 10‰ of the weight of fertilizer urea, and the environmentally friendly material used for coating is : Acrylic resin RS100.

[0022] The production process of Feixin: using fluidized bed spray granulation, the urease inhibitor N-butyl thiophosphoric triamide (NBPT) is miscible in urea solution, and small particles of urea (diameter < 1.0mm) are used as crystals Type, spray granulation, when the average diameter of fertilizer particles reaches 3.5 to 4.0, the granulation ends.

[0023] Coating process: fluidized bed spray coating method is adopted, and the equipment used is XLB type fluidized bed pelletizing machine; specific operation is: dissolve 100 parts of environmentally friendly material acrylic resin RS100 used for coating in 1500 parts of 85%...

Embodiment 2

[0034] Embodiment 2 is coated with the nitrogen-containing compound fertilizer of cellulose acetate

[0035] Nitrogen-containing compound fertilizer and nitrification inhibitor are dicyandiamide (DCD) and 3,4-dimethylpyrazole phosphate (DMPP) as the fertilizer core, and DCD and DMPP are 15‰ of the nitrogen weight of the fertilizer, of which: DCD and DMPP The weight ratio is 2:1, the nitrogen fertilizer source of the nitrogen-containing compound fertilizer is ammonium sulfate, and the environment-friendly material used for coating is: cellulose acetate in biological resource macromolecule materials and its derivatives.

[0036] The production process of fertilizer core: use drum spray granulation, mix nitrification inhibitor DCD and DMPP in chemical fertilizer mixed solution, use small particle compound fertilizer (diameter<1.0mm) as crystal seed, spray granulation, when When the average diameter of fertilizer particles reaches 3.5 to 4.0, the granulation ends.

[0037] Coatin...

Embodiment 3

[0048] Embodiment 3 is coated with the nitrogen-containing compound fertilizer of starch and vinyl acetate blend

[0049] Nitrogen-containing compound fertilizer and urease inhibitor hydroquinone (HQ) and nitrification inhibitor dicyandiamide (DCD) are used as the fertilizer core. The sources of nitrogen fertilizer in the nitrogen-containing compound fertilizer are urea and diammonium phosphate, and HQ is urea weight. 3‰, DCD is 5‰ of fertilizer nitrogen weight, and the environmentally friendly material used for coating is: starch and vinyl acetate blends in starch and its derivatives.

[0050] The production process of fertilizer core: using disc mixing granulation, mixing urease inhibitor and nitrification inhibitor DCD in urea solution, spraying the urea solution while mixing granulation, and ending when the average diameter of fertilizer particles reaches 3.5-4.0 Granulate.

[0051] Coating process: adopt the coating method of spray coating on a fluidized bed, and the equ...

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Abstract

The present invention relates to a controlled release fertilizer, especially, a new controlled release fertilizer and its production process. The controlled release fertilizer comprising coating of environmentally friendly material and fertilizer core, which is nitrous fertilizer containing urease inhibitor and/or nitration inhibitor. The production process includes fertilizer core preparation via spray granulating in fluidized bed, or spray granulating in rotating drum, or disc mixing granulating; and physical coating via spraying in fluidized bed. The fertilizer has good controlled release effect and wide application range, and is environmentally friendly and low in cost.

Description

technical field [0001] The invention relates to a controlled-release fertilizer, in particular to a novel controlled-release fertilizer combined with a coating and an inhibitor and a preparation method thereof. Background technique [0002] The development of slow (controlled) release fertilizers has a history of nearly 80 years. For the modification of traditional chemical fertilizers, fertilizer scientists have successively developed coated (wrapped) fertilizers (fertilizer I) and urease inhibitors and nitrification inhibitors. Slow-release fertilizers (fertilizers II), both of which have their pros and cons. [0003] The nutrient release rate of fertilizer I was mainly determined by the characteristics of the coating wall material, and was relatively less affected by the soil environmental conditions. Its nutrient release rate is relatively uniform and slow, and the nutrient release curve is relatively regular, which is similar to the crop nutrient absorption curve. The ...

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/90C05G5/00
Inventor 武志杰张海军梁文举陈利军李荣华
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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