Beijing region winter wheat divisional nitrogen application method giving consideration to area yield and environmental risk

Abstract

The invention relates to a Beijing region winter wheat divisional nitrogen application method giving consideration to area yield and environmental risk. The method comprises the following steps of 1, dividing a middle-high producing area and a middle-low producing area according to different winter wheat yield levels in different Beijing regions, wherein the region with a winter wheat yield greater than or equal to 6000kg / hm<2> is defined as the middle-high producing area and the region with a winter wheat yield less than 6000kg / hm<2> is defined as the middle-low producing area, and 2, carrying out nitrogen fertilizer application on winter wheat in the middle-high producing area according to a nitrogen fertilizer application ratio of 130+ / -13Kg / hm<2> and carrying out nitrogen fertilizer application on winter wheat in the middle-low producing area according to a nitrogen fertilizer application ratio of 180+ / -18Kg / hm<2>. The method utilizes combination of linear regression-platform regression combined method-based inflection point yield study, a soil nitrate leaching loss dynamic monitoring method and an ammonia nitrogen volatilization dynamic monitoring method to determine the optimal threshold, promotes agricultural production and environmental protection harmonious development, and realizes a high yield and minimization of environmental pollution.

Description

technical field [0001] The invention belongs to the field of agricultural technology, and in particular relates to a method for nitrogen fertilization of winter wheat in Beijing area in consideration of both regional yield and environmental risk. Background technique [0002] As we all know, chemical fertilizers play an important role in increasing food production and maintaining national food security. But all the time, there is nitrogen, phosphorus fertilizer excessive application in winter wheat fertilization in Beijing area, and fertilizer utilization rate is low (nitrogen utilization rate is about 30%~35%, phosphorus is about 10%~20%, potassium is about 35%~50%) %) and other outstanding problems, which lead to an increase in the production cost of winter wheat and an increase in the ecological environment risk. Specifically, in the winter wheat rotation system in Beijing, the total annual input of farmland nitrogen is 669kg / hm 2 , the total annual output is 583kg / hm ...

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Problems solved by technology

However, in the Beijing area, according to the soil and climate characteristics of different winter wheat production areas, there are few reports on how to determine the amount of nitrogen application to minimize air and groundwater pollution without reducing production. A few reports only focus on one aspect. And the research method is old (CN201310060360.6; CN201410574465.8)

For example, in the research on the coupling of yield and soil nitrate nitrogen, the yield analysis adopts the parabolic method, and the nitrate nitrogen is measured by the residual nitrate nitrogen in the soil after harvesting winter wheat. The problem is that the parabolic method is used to determine the inflection point of yield by human eyes. , it is difficult to calculate the specific value, which will lead to increased errors; and the determination of the residual nitrate nitrogen in the soil after crop harvest cannot explain the risk of groundwater pollution. It is necessary to calculate the nitrate nitrogen leached out of the crop root system during the crop growth period be persuasive

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