Method for evaluation of agricultural soil nitrate nitrogen leaching loss and application

Abstract

The invention discloses a method for evaluation of agricultural soil nitrate nitrogen leaching loss. The method is specifically implemented according to the steps of: dividing a soil profile into surface soil, middle soil and bottom soil; acquiring the respective soil physical clay content percentage of the surface soil, the middle soil and the bottom soil; acquiring a surface soil texture coefficient, a middle soil texture coefficient and a bottom soil texture coefficient; taking importance degree of agricultural soil nitrate nitrogen leaching loss as the basis, conducting weight assignment to all layers of soil to obtain a surface soil texture coefficient weight, a middle soil texture coefficient weight, and a bottom soil texture coefficient weight; calculating a soil nitrate nitrogen leaching loss index, and determining the evaluation criterion. The method provided by the invention evaluates the soil nitrate nitrogen leaching loss degree, then determines the nitrogen application amount of crops and the fertilizing method, and avoids pollution of nitrate nitrogen leaching loss caused by excessive use of nitrogen fertilizer to underground water.

Description

technical field [0001] The invention belongs to the technical field of agricultural resources and environment, and in particular relates to a method and application for evaluating nitrate nitrogen leaching in farmland soil. Background technique [0002] Nitrate nitrogen is one of the main forms in which fertilizer nitrogen fertilizer is converted into available nutrients in the soil during crop planting, providing nitrogen sources for high-yield and high-efficiency growth of agricultural products. However, the long-term application of large amounts of nitrogen fertilizers is likely to cause leaching of nitrate nitrogen in the soil, which in turn will cause nitrate pollution in groundwater. Modern scientific research shows that 77% of the pollution load of groundwater comes from the fertilizers applied to the soil. Intensive high-yield agricultural production areas with excessive application of nitrogen fertilizers and flood irrigation are the main areas that cause groundwat...

AI Technical Summary

Problems solved by technology

[0003] Existing nitrogen application rates and fertilization methods for crops generally apply nitrogen fertilizers based on empirical values, and adopt customary fertilization methods, ignoring the influence of soil configuration on nitrate nitrogen leaching, which easily leads to excessive application of nitrogen fertilizers Phenomenon, when the amount of nitrogen fertilizer is used too much, it is easy to cause soil nitrate nitrogen leaching to pollute the groundwater

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