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

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...

Images