Environment-friendly coated urea for reducing N2O discharge effectively

Abstract

The invention discloses an environment-friendly coated urea for reducing N2O discharge effectively. The coated urea is prepared from a coating material, a nitrification inhibitor and an adhesive, wherein the coating material is selected from clay minerals and charcoal. The effect is optimum by compounding bentonite and rice straw charcoal. The charcoal adjusts the soil structure, supplements organic matters, provides nutrients and creates a good environment for microorganisms primarily. The bentonite exerts the caking property and the water absorbing expansion character, so that a purpose of retaining water and nutrients at the same time can be achieved. Combined with the nitrification inhibitor, the nitrogen leaching loss and N2O discharge can be reduced to the maximum extent, and nitrogen is controlled in an effective state. Experiments verify that under a condition of simulating continuous intense fall in the South, the effect of the coated urea is superior to that of conventional urea greatly, and 67% of N2O discharge can be reduced. Under a non-intense fall condition, compared with the conventional urea, the N2O discharge of the coated urea prepared by the method is averagely reduced by 77.83%.

Description

technical field [0001] The invention belongs to the field of agricultural fertilizers, in particular to a method for effectively reducing N 2 Environmentally friendly coated urea for O emissions. Background technique [0002] Increasing nitrogen fertilizer input is the most direct and effective measure to increase production in the agricultural field. Conventional urea has strong water solubility, is easy to decompose and lose, and has low fertilizer utilization rate. In a humid soil environment, conventional urea will be completely dissolved in a few hours, and it will be completely decomposed in about a week, existing in the soil in the form of ammonium nitrogen, and the ammonium nitrogen will be nitrified into nitrate nitrogen (NO 3 -N, NO 2 etc.), causing nitrate nitrogen leaching and N 2 O emissions. Studies have shown that the average nitrogen leaching rate in tropical and subtropical rainy and humid areas is 25.5%, and nitrogen loss through leaching and runoff ac...

AI Technical Summary

Problems solved by technology

In actual production, the controlled release effect of the coated fertilizer made of a single biodegradable material is not ideal, and a variety of wrapping materials are usually used, and the process is relatively complicated

Coated urea on the market does not consider the nitrogen leaching loss performance and N 2 O emission law

However, heavy rain can easily lead to leaching loss of soil nitrogen, which affects soil temperature, humidity, microorganisms and air temperature, thereby affecting soil N 2 O emissions

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