Method for determining dry crop nitrogen input environment threshold based on regional scales

Abstract

The invention discloses a method for determining a dry crop nitrogen input environment threshold based on a regional scale. The method comprises the following steps: determining a nitrogen application rate under a highest relative yield within a region, primarily determining the dry crop nitrogen input environment threshold based on the regional scale, evaluating a regional yield risk and an environmental risk of the primarily determined nitrogen input environment threshold, and finally determining the dry crop nitrogen input environment threshold based on the regional scale. The method disclosed by the invention is used for determining the nitrogen application rate corresponding to the highest relative yield with the nitrogen input environment threshold based on the regional scale of 98%. The nitrogen input environment threshold determined by the method disclosed by the invention is obtained based on the historical data of the regional scale and current experimental data of a regional scale soil type, the method has wide regional adaptability and feasibility, the yield risk and the environmental risk are evaluated by test points, and the dry crop nitrogen input environment threshold is finally determined, so that the implementation effect is safe and reliable. A high crop yield can be maintained, and the environmental pollution risk caused by excessive nitrogen fertilizer application can be effectively and greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of agricultural environmental protection, and in particular relates to a method for determining an environmental threshold based on regional-scale dryland crop nitrogen input. Background technique [0002] Nitrogen is one of the nutrient elements that plants have a large demand for, and is an important limiting factor that determines soil productivity. The extensive use of nitrogen fertilizer has greatly promoted the crop yield in the process of modern agricultural production, and the contribution rate of nitrogen fertilizer in the increase of crop yield has reached more than 40%. However, the excessive use of chemical fertilizers has not only increased the cost of agricultural production and reduced the actual income of farmers; it has also caused increasingly serious environmental safety issues such as agricultural non-point source pollution, eutrophication of surface water, and excessive nitrate in ground...

AI Technical Summary

Problems solved by technology

Although some studies have quantified the environmental risk under this agronomic threshold, they are all based on the field scale and have not been systematically quantified from the main nitrogen loss pathways such as underground leaching, surface runoff, or ammonia volatilization at the regional scale. Determination of nitrogen losses, nor yield and environmental risk assessments for proposed nitrogen input thresholds

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