Method for matching and applying nitrification inhibitor and biomass carbon to improve nitrogen fertilizer utilization rate and application thereof

Abstract

The invention provides a method for matching and applying a nitrification inhibitor and biomass carbon to improve a nitrogen fertilizer utilization rate and an application thereof. The method is characterized by comprising the following steps of: smoldering crop straws to prepare the biomass carbon; and mixing dicyandiamide and the biomass carbon and applying the mixture into soil; and adding an ammonium nitrogen fertilizer. When the application amount of an ammonium state or an amide state is 200-400 mgN per kg of soil, the utilization amount of the dicyandiamide is 5-50 mg / kg and the utilization amount of the biomass carbon is 50 g per kg of the soil. The method comprises the following specific application steps of: mixing the biomass carbon and the dicyandiamide and applying the mixture on surface-layer soil to be sufficiently mixed with the soil; and then, applying a chemical nitrogen fertilizer according to a conventional method. The method utilizes the characteristic that the biomass carbon has the very strong adsorption capability on the nitrification inhibitor and the dicyandiamide; before a chemical fertilizer is applied, the biomass carbon and the dicyandiamide are mixed and applied into the soil; and the keeping time of the dicyandiamide in the soil is improved and the inhibition effect of a nitration reaction of converting ammonium nitrogen to nitrate nitrogen is prolonged, so that the leaching loss of nitrogen is reduced and the nitrogen fertilizer utilization rate is improved.

Description

technical field [0001] The invention belongs to the field of compound fertilizer development, and relates to the combined application of nitrification inhibitors and biomass charcoal to reduce nitrogen leaching loss and improve the utilization rate of nitrogen fertilizer. Background technique [0002] The amount of nitrogen fertilizer applied to farmland soil in the rice-wheat rotation area of ​​Taihu Lake can reach 500-600kg N / ha per year (Xing et al., 2001. Sci.China Ser.B), and under the condition of protected cultivation, the amount of nitrogen fertilizer can even be as high as 1000kg N / ha ( Jiang Huimin et al., 2010. Journal of Agricultural and Environmental Sciences), while the utilization rate of nitrogen fertilizer in my country's farmland is often only about 30% (Zhu Zhaoliang, 1992. Science Press), and decreases with the increase of nitrogen fertilizer application (Jiang Jun et al., 2005. Nanjing Agricultural University Journal). After nitrogen fertilizer is applied...

AI Technical Summary

Problems solved by technology

However, due to the leaching loss of the nitrification inhibitor itself, its inhibitory effect on the nitrification reaction cannot be sustained (Bremner et al., 1978. Soil Biol. Biochem.), which is why the nitrification inhibitor is used in tropical, One of the reasons why subtropical regions have not been promoted

If certain technical measures can be taken to prolong the residence time of nitrification inhibitors in the soil, their inhibitory effect on nitrification can be extended, but there are few studies on this aspect at present.

Images