A method and application for evaluating nitrate nitrogen leaching in farmland soil

Abstract

The invention discloses a method for evaluating nitrate nitrogen leaching loss in farmland soil, which is implemented according to the following steps: divide the soil profile into surface soil, middle soil, and bottom soil; obtain the respective values ​​of surface soil, middle soil, and bottom soil respectively. The percentage of soil physical clay content; obtain the surface soil texture coefficient, middle soil texture coefficient and bottom soil texture coefficient respectively; based on the importance of nitrate nitrogen leaching in farmland soil, assign weights to each layer of soil to obtain the surface layer Soil texture coefficient weight, middle soil texture coefficient weight and bottom soil texture coefficient weight; calculate soil nitrate nitrogen leaching loss index and determine evaluation standards. The present invention evaluates the degree of soil nitrate nitrogen leaching, and then determines the nitrogen application amount and fertilization method of crops according to the evaluation standards to avoid the pollution of groundwater caused by nitrate nitrogen leaching caused by excessive use of nitrogen fertilizer.

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...

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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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