Beijing area summer corn partition phosphorus applying method concurrently considering region yield and environmental risk

Abstract

The present invention relates to a Beijing area summer corn partition phosphorus applying method concurrently considering region yield and environmental risk. The method comprises that: 1) a medium-high yield area and a medium-low yield area are divided according to different summer corn yields in different regions of the Beijing area, wherein the yield of more than or equal to 6800 kg / hm<2> is defined as the medium-high yield area, and the yield of less than or equal to 6800 kg / hm<2> is defined as the medium-low yield area; and 2) the phosphorus fertilizer is applied on the summer corn in the medium-high yield area according to the phosphorus fertilizer applying amount of 30+ / -3 kg P2O5.hm<-2>, and the phosphorus fertilizer is applied on the summer corn in the medium-low yield area according to the phosphorus fertilizer applying amount of 50+ / -5 kg P2O5.hm<-2>. According to the present invention, the linear plus platform regression model method for researching the yield inflection point and the soil nitrate phosphorus dynamic monitoring method are organically combined to determine the optimal threshold value, the diffused pollution is scientifically prevented and controlled, the coordinated development of the agricultural production and the environmental protection is promoted, and the optimal effects of the high yield and the minimized environmental pollution are achieved.

Description

technical field [0001] The invention belongs to the field of agricultural technology, and in particular relates to a method for applying phosphorus to summer corn in the 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 ensuring food production and national food security. However, there has always been excessive application of nitrogen and phosphorus fertilizers in the fertilization of summer corn in the Beijing area, and the fertilizer utilization rate is low (the nitrogen utilization rate is about 30% to 35%, the phosphorus is about 10% to 20%, and the potassium is about 35% to 50%). %) and other outstanding problems, leading to an increase in the production cost of summer corn and an increase in the risk of ecological environment. Specifically, 75% to 90% of the phosphorus in my country's total fertilization is retained in the soil, and soil erosion cau...

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Problems solved by technology

However, in the Beijing area, according to the soil and climate characteristics of different summer corn production areas, there are few reports on how to determine the amount of phosphorus 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 available phosphorus, the yield analysis uses the parabolic method, and the available phosphorus uses the residual available phosphorus in the soil after harvesting summer corn. The problem is that the parabolic method is used to determine the yield inflection point by human eyes. It is difficult to calculate the specific value, which will lead to increased errors; the determination of the residual available phosphorus in the soil after crop harvest cannot explain the risk of groundwater pollution (the soil itself is a huge phosphorus pool with a strong buffering effect, and the residual available phosphorus is difficult to reflect the inflection point of yield), it is convincing to calculate the phosphorus leached out of the crop root system during the crop growth period

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