Calculation method for farmland nitrogen input threshold

Abstract

Belonging to the technical field of agricultural environmental protection, the invention relates to a calculation method for a farmland nitrogen input threshold. The calculation method for the farmland nitrogen input threshold is carried out according to the steps of: conducting comparison planting and data statistics; utilizing the statistical result to determine the farmland crop's output nitrogen threshold and the farmland's environmental nitrogen input threshold; determining the farmland soil type according to the crop's output nitrogen threshold and the regional farmland's environmental input nitrogen threshold, dividing the soil fertility level, and correcting the determined nitrogen input threshold; and finally, calculating the farmland nitrogen input threshold. According to the invention, the farmland nitrogen input threshold is calculated based on the crop's output nitrogen threshold and the regional farmland's environmental input nitrogen threshold, a nitrogen fertilizer can be reasonably used to reach the production increase effect, at the same time, wasting is avoided, the influence to the soil ecological environment can be avoided, balance between supply and demand can be realized, rational use of soil is promoted, and the contradiction between fertility and pollution and the contradiction between yield increase and energy saving in long-term use of farmland are solved. Thus, the method provided by the invention plays an important role in leading the agricultural industry to sustainable and healthy development.

Description

technical field [0001] The invention relates to a calculation method for a threshold value of nitrogen input in farmland, which belongs to the technical field of agricultural environmental protection. Background technique [0002] With the development of human social economy and science and technology, due to the increase of population pressure, the human demand for agricultural products is increasing, thus increasing the investment in agricultural production, especially the use of chemical fertilizers. The contribution of chemical fertilizers to agriculture is well known, and an important feature of modern agriculture is the use of chemical fertilizers. Nitrogen fertilizer is the most widely used fertilizer in the world. According to statistics, in the 50 years from 1949 to 1998, there was a significant correlation between my country's total annual grain output and the annual application of chemical fertilizer nitrogen. Thousands of years before the chemical fertilizer ind...

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Problems solved by technology

[0006] The pollution of agricultural products and the impact of chemical fertilizers on the soil ecological environment are mainly reflected in: (1) causing soil acidification and compaction, destroying soil structure, inhibiting soil microbial activity, causing soil nitrate pollution and soil secondary salinization (2) application Pollution of nitrogen fertilizer to water environment: lead to eutrophication of water body salt, nitrogen leaching to pollute groundwater (3) The impact of nitrogen fertilizer application on atmospheric environment: nitrogen volatilization pollutes the atmosphere, NOx emission forms acid rain, destroys the ozone layer, and leads to greenhouse effect (4 ) Excessive application of nitrogen fertilizers on the pollution of crop products and the impact on the food chain: polluting crop products, affecting crop quality, and causing "environmental hormones" problems

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