Slowly releasing or release controlled urea and its preparing process

A technology of controlled release and urea, applied in the directions of urea compound fertilizer, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of inability to achieve the beneficial effect of slow-release nitrogen fertilizer, difficult release of fertility, loss of fertility, etc., to achieve good ecological effect, slow release, reduce effect of loss

Inactive Publication Date: 2002-12-04
孙成
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the water-soluble nitrogen fertilizer for the slow release of fertility is mainly a physical coating method. Both WO-8801132 and US-5547486 mention the application of chemical reactions to form chemical bonds between the coating material and the surface of the fertilizer, making the surface hydrophobic. , this coating method has a very good hydrophobic surface, but when the surface is not damaged, the fertility is not easy to release, and after the surface film is damaged, the fertility is released quickly, because the plant root system cannot quickly absorb all the released fertility, resulting in Fertility is lost due to the volatilization or denitrification of nitrogen-containing ions, so the beneficial effect of slow-release nitrogen fertilizer cannot be achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Weigh raw materials according to the following weights:

[0042] Ordinary large grain urea (particle size 2-4 mm) 80 kg,

[0043] Urease inhibitor (commercially available) 0.8 kg,

[0044] Magnesium oxide (fired at low temperature) 5 kg.

[0045] Mix ordinary large-grain urea and urease inhibitor first, after mixing evenly, then mix in magnesium oxide, and stir evenly.

example 2

[0047] Weigh raw materials according to the following weights:

[0048] Ordinary large grain urea (particle size 2-4 mm) 50 kg,

[0049] Urease inhibitor (commercially available) 0.6 kg,

[0050] Magnesium oxide (fired at low temperature) 4 kg.

[0051] Mix ordinary large-grain urea and urease inhibitor first, after mixing evenly, then mix in magnesium oxide, and stir evenly.

example 3

[0053] Weigh raw materials according to the following weights:

[0054] Ordinary large urea (particle size 2-4 mm) 110 kg,

[0055] Urease inhibitor (commercially available) 1.0 kg,

[0056] Magnesium oxide (fired at low temperature) 7 kg.

[0057] Mix ordinary large-grain urea and urease inhibitor first, after mixing evenly, then mix in magnesium oxide, and stir evenly.

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PUM

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Abstract

A slowly-releasing or releasing controlled urea is prepared from ordinary big urea particles (50-120 wt. portions), urease inhibitor (0.4-1.2 wt. portions) and magnesium oxide (3-8 wt. portions). Itsadvantages is high effect on controlling the hydrolysis procedure of urea for higher utilization rate.

Description

technical field [0001] The invention discloses a urea and a preparation method thereof, and more particularly discloses a sustained-release and controlled-release urea and a preparation method thereof. Background technique [0002] Nitrogen fertilizers such as urea and ammonium chloride are highly soluble nitrogen fertilizers. Due to the leaching of fertilizers in farmland by irrigation and rainfall, groundwater and lake water surfaces have become eutrophic. Only in the Beijing area, If 20 kg of urea is applied per mu, 4 to 6 kg will be lost, and the waste rate will reach 20 to 30% due to water leaching alone. Therefore, improving the utilization rate of chemical fertilizers, especially nitrogen fertilizers, has become an important issue that is concerned and urgently to be solved by relevant parties at home and abroad in recent years. [0003] In the prior art, the water-soluble nitrogen fertilizer for the slow release of fertility is mainly a physical coating method. Both...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/00C05G3/90
Inventor 孙成
Owner 孙成
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