Biochar-based slow-release nitrogen fertilizer and preparation method thereof

A biochar and nitrogen fertilizer technology, which is applied in the direction of nitrogen fertilizer, ammonium salt fertilizer, fertilization device, etc., can solve the problems of not using biochar, etc., and achieve obvious effects of increasing production, wide application range, and good slow-release effect

Active Publication Date: 2015-04-22
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The function principle of the coating is the same as that of the traditional slow-release fertilizer, except that a small amount of biochar is added to the coated urea; the blending and adsorption mainly use the specific surface adsorption of biochar to slowly release the fertilizer, but one of the characteristics of biochar is its Porous body structure, surface adsorption has a slow release effect on nitrogen fertilizer, but does not use the porous body structure of biochar

Method used

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  • Biochar-based slow-release nitrogen fertilizer and preparation method thereof
  • Biochar-based slow-release nitrogen fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] Example 1: Preparation of biochar-based slow-release nitrogen fertilizer and its release efficiency test

[0031] 1. Preparation of biochar-based slow-release nitrogen fertilizer:

[0032] 1) Biochar obtained by mixing agricultural straw and garden waste purchased on the market at 400°C (purchased from Biomass Gasification Engineering Company, Lijiachang Village, Weishanzhuang Town, Daxing District, Beijing, biochar with a nitrogen content of 1.25%, Available Potassium 1625mg·kg -1 , available phosphorus 238mg·kg -1 , exchangeable calcium 2.36g·kg -1 , exchangeable magnesium 0.74g·kg -1 , pH 10.84, CEC 13.0cmol kg -1 , EC (water-carbon ratio 10:1) 4325μs cm -1 ) 10kg, the urea with nitrogen content ≥ 46% bought by the fertilizer factory, the pulverized particle diameter after being pulverized respectively is that the qualities such as 20 mesh biochar and urea are fully mixed, and set aside;

[0033] 2) Pack the biochar and urea mixed uniformly in step 1) with a hi...

Embodiment 2

[0042] Example 2: Preparation of biochar-based slow-release nitrogen fertilizer and its fertilization effect test

[0043] 1. Preparation of biochar-based slow-release nitrogen fertilizer:

[0044]1) Biochar obtained by mixing agricultural straw and garden waste purchased on the market at 700°C (purchased from Biomass Gasification Engineering Company, Lijiachang Village, Weishanzhuang Town, Daxing District, Beijing, biochar with a nitrogen content of 1.25%, Available Potassium 1625mg·kg -1 , available phosphorus 238mg·kg -1 , exchangeable calcium 2.36g·kg -1 , exchangeable magnesium 0.74g·kg -1 , pH 10.84, CEC 13.0cmol kg -1 , EC (water-carbon ratio 10:1) 4325μs cm -1 ) 10kg, the urea with nitrogen content ≥ 46% bought by the fertilizer factory, the pulverized particle diameter after being pulverized respectively is that the qualities such as 20 mesh biochar and urea are fully mixed, and set aside;

[0045] 2) Put the biochar and urea mixed uniformly in step 1) into a hi...

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Abstract

The invention relates to a biochar-based slow-release nitrogen fertilizer and a preparation method thereof. The biochar-based slow-release nitrogen fertilizer consists of the following components in parts by mass: 45-55 parts of biochar and 45-55 parts of a nitrogen fertilizer. The preparation method comprises the following steps: grinding the biochar and the nitrogen fertilizer, uniformly mixing the biochar and the nitrogen fertilizer subjected to grinding treatment, heating until the nitrogen fertilizer is melted, allowing the melted nitrogen fertilizer to enter the porous structure of the biochar in a pressurized mode, uniformly mixing, and granulating, thereby obtaining the biochar-based slow-release nitrogen fertilizer, wherein the pressurization pressure is 0.1-0.15MPa. According to the preparation method disclosed by the invention, the fertilizer can enter the porous structure of the biochar, and the nitrogen fertilizer has the advantages of good slow release effect and long slow release time. Meanwhile, wastes are recycled, the pollution of coating materials to soil is avoided, and the biochar-based slow-release nitrogen fertilizer can be applied to fertilization of field crops, greenhouse vegetables and fruit trees and has good effects of improving the quality and improving the efficiency.

Description

technical field [0001] The invention belongs to the technical field of compounding chemical nitrogen fertilizer and biochar, and in particular relates to a biochar-based slow-release nitrogen fertilizer and a preparation method thereof. Background technique [0002] my country is the country with the largest nitrogen fertilizer consumption in the world, and this consumption is still increasing. At the same time of high nitrogen application rate, the nitrogen utilization rate in my country has always been low, only about 30% to 35%. In recent years, the research on the nitrogen utilization rate of facility vegetables shows that the nitrogen utilization rate of the season is only 3.70%. ~30.80%. The result of excessive fertilization must be the aggravation of nitrogen leaching. The role of slow and controlled release fertilizers in improving nitrogen use efficiency, reducing soil nitrate nitrogen accumulation, and reducing nitrate pollution in groundwater has received widespr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
CPCC05C1/00C05G3/00C05G3/80C05C3/00C05C9/00C05C5/02
Inventor 廖上强孙焱鑫陈延华杨俊刚张琳李艳梅刘宝存
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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