Beijing area winter wheat partitioned phosphorous applying method considering area yield and environment risk

Abstract

The invention relates a Beijing winter wheat partitioned phosphorous applying method considering the area yield and the environment risk. The method comprises the following steps: (1) dividing a middle-high yield area and a middle-low yield area according to different winter wheat yield levels in different areas in the Beijing area, defining the area with the winter wheat yield not less than 6000kg / hm<2> as the middle-high yield area, and the area with the winter wheat yield less than 6000kg / hm<2> as the middle-low yield area; (2) applying a phosphate fertilizer onto winter wheat in the middle-high yield area according to the phosphorous applying amount being 50+ / -5kg P2O5 / hm<2>; and applying the phosphate fertilizer onto the winter wheat in the middle-low yield area according to the phosphorous applying amount being 70+ / -7kg P2O5 / hm<2>. An optimal threshold value is determined through organic combination of a linear and platform regressing model method to research the yield inflection point and a soil phosphorous loss dynamic monitoring method, the harmonious development of the agricultural production and environment protection is promoted, and the optimal effects of high yield and the environment pollution minimizing are achieved at the same time.

Description

technical field [0001] The invention belongs to the technical field of agriculture, and in particular relates to a method for zonal application of phosphorus in winter wheat in Beijing, which takes into account regional yield and environmental risks. Background technique [0002] As we all know, the role of chemical fertilizers in ensuring the increase of grain production and national food security is indispensable. However, there has always been excessive application of nitrogen and phosphorus fertilizers in the fertilization of winter wheat in Beijing, and the fertilizer utilization rate is low (the nitrogen utilization rate is about 30% to 35%, phosphorus is about 10% to 20%, and potassium is about 35% to 50%. ) and other prominent problems, resulting in increased winter wheat production costs and increased ecological and environmental risks. Specifically, 75% to 90% of the total fertilization in my country remains in the soil, and soil erosion leads to a large amount of...

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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 phosphorus application to minimize air and groundwater pollution without reducing production. A few reports only focus on one aspect, and Old research methods (CN201310060360.6; CN201410574465.8)

For example, in the research on the coupling of yield and soil available phosphorus, the yield analysis adopts the parabolic method, and the available phosphorus uses the residual available phosphorus in the soil after harvesting winter wheat. The problem is that the parabolic method is difficult to determine the yield inflection point by human eyes. Calculating specific values ​​will lead to increased errors; the determination of residual available phosphorus in the soil after harvesting crops 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 react Yield inflection point), it is convincing to calculate the phosphorus leached out of the crop root system during the crop growth period

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