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Urease/nitrating inhibitor composite slow releasing urea and its preparing method

A technology of nitrification inhibitor and urease inhibitor, which is applied in the field of slow-release urea and its preparation, can solve the problems of urea nitrogen nitrification and denitrification loss, etc., and achieves the advantages of reducing nitrate nitrogen leaching, easy control and emission reduction. Effect

Active Publication Date: 2006-06-07
沈阳中科新型肥料有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This patent application technology has been implemented in Liaoning Jinxi Natural Gas Chemical Co., Ltd., realizing the industrial production of slow-release urea; although this slow-release urea controls the hydrolysis pathway of urea nitrogen in the soil, it has a significant increase in production and production compared with ordinary urea. However, the nitrification and denitrification losses of urea nitrogen in the soil still account for a large proportion

Method used

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  • Urease/nitrating inhibitor composite slow releasing urea and its preparing method
  • Urease/nitrating inhibitor composite slow releasing urea and its preparing method

Examples

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Effect test

Embodiment 1

[0024] Weigh 995.9g of ordinary urea into a 2000ml beaker, put the beaker into an oil bath preheated to 138-140°C (the oil bath heater contains a temperature control device, and the oil temperature in the pot should not be higher than 140°C ), 10-20 minutes ordinary urea is completely dissolved;

[0025] Weigh 0.5g of urease inhibitor LNS and 3.6g of nitrification inhibitor DCD according to the stated ratio, add it to the dissolved ordinary urea, stir it with a glass rod for 1-2 minutes, and pour it into two 40cm×60cm white porcelain Cool in the tray, grind the sample after it is completely cooled, pass through 1mm and 3mm sieves respectively, and the finished product with a pore size of 1-3mm is the urease / nitrification inhibitor combined slow-release urea. The application rate of this slow-release urea on vegetable crops is 15-30kg per mu and per season.

Embodiment 2

[0027] The basic steps of embodiment 2 are the same as embodiment 1; the difference from embodiment 1 is that formula composition and production conditions are provided in table 1, and its numbering is respectively 2-7.

[0028] Numbering

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Abstract

The present invention relates to a slow releasing fertilizer, and especially a kind of urease / nitrating inhibitor composite slow releasing urea and its preparation process. The urease / nitrating inhibitor composite slow releasing urea consists of urea 99.40-99.78 wt%, urease inhibitor N-methyl-2-pyrrolidone 0.02-0.08 wt%, and nitrating inhibitor dicyandiamine 0.14-0.58 wt%. The preparation process includes mixing common urea with N-methyl-2-pyrrolidone and dicyandiamine in certain weight proportion at 138-140 deg.c under oil bath condition, cooling, crushing and sieving. The present invention has simple preparation process and low apparatus cost, and the product is used as once base fertilizer needing no top dressing and is suitable for vegetable, field crop and fruit tree.

Description

technical field [0001] The invention relates to a slow-release fertilizer, in particular to a combined slow-release urea which utilizes common urea, urease inhibitors and nitrification inhibitors to produce inhibitors and a preparation method thereof. Background technique [0002] The application of urease inhibitors and nitrification inhibitors through soil biochemical methods can slow down the loss of urea N in soil and improve the utilization rate of chemical nitrogen fertilizers. There are hundreds of compounds that have been found to inhibit urease activity. However, due to high cost or potential environmental pollution, there are very few inhibitors that can be widely used in production. [0003] LNS is a liquid urease inhibitor in the invention patent "Liquid urea synergist and its application" (authorization number: ZL 99 1 22536.8) submitted by the applicant in 1999. In the urea production line to produce slow-release urea products. This patent application technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C9/00C05G3/90
Inventor 梁文举姜勇于德清孟凡祥
Owner 沈阳中科新型肥料有限公司
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