Method of determining accurate nitrogen fertilizer applying amount in wheat

Abstract

The invention relates to a method of determining accurate nitrogen fertilizer applying amount in wheat. In the method, the nitrogen fertilizer applying amount is equal to the difference of the output minus the apparent mineralization amount of soil nitrogen, the nutrient input from environmental nutrients, the amount of nitrogen brought by seeds and the amount of nitrate nitrogen in the 1-meter soil layer before sowing, wherein the output comprises the amount of nitrogen absorbed by crops, the amount of the safety residue of the soil nitrate nitrogen after harvest and the amount of soil nitrogen loss; the amount of the safety residue of the soil nitrate nitrogen after harvest can be obtained through analysis of samples from the 1-meter soil layer of a majority of soil in the sowing land. The invention can determine the nitrogen fertilizer applying amount according to the balance of the nitrogen input and the nitrogen output into the soil-plant system, thereby realizing the accurate application of the nitrogen fertilizer, improving the yield of crops and the absorption and utilization of nitrogen, and reducing the residue of the soil nitrate nitrogen and other negative effects of the nitrogen fertilizer. Therefore, the invention has a high practical value.

Description

Technical field [0001] The invention relates to a method for determining the amount of nitrogen fertilizer applied to wheat, in particular to a method for determining the amount of accurately applied nitrogen fertilizer for wheat. Background technique [0002] In the dry land of Northwest China, in addition to water, the soil is barren, the organic matter content is low, and the poor nitrogen supply capacity is another key factor restricting the high and stable yield of wheat. However, a large number of experiments have proved that due to the low content of soil organic matter and weak microbial activity, the ability to fix and retain inorganic mineral nitrogen in the soil is limited. The increase in crop yields through the application of large amounts of chemical nitrogen fertilizer will not only cause waste of nutrient resources, but also Lead to serious environmental problems, such as soil nitrate nitrogen residues, leaching, runoff, volatilization, denitrification losses, pol...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for determining the amount of nitrogen fertilizer applied accurately to wheat, effectively solving the technical problem of nitrogen fertilizer residue