Method for preventing and controlling agricultural non-point source pollution of hilly and mountainous regions through nitrogen and phosphorus interception ditches

Abstract

The invention discloses a method for preventing and controlling agricultural non-point source pollution in hilly and mountainous areas by utilizing nitrogen and phosphorus intercepting ditches. This method is based on the distribution of farmland in hilly and mountainous areas, and according to the slope and elevation of the farmland area, build multi-level interception ditches. The horizontal distance between the two levels of interception ditches is 50 meters. The bottom of the interception ditch is a nitrogen and phosphorus interception layer with a thickness of 0.5 meters, and it is suppressed with a covering soil with a thickness of 0.2 meters. The nitrogen and phosphorus interception layer is formed by mixing straw, sawdust and soil with a mass ratio of 1:3:1. This method can Remove 30% of the nitrogen content and 25% of the phosphorus content in agricultural non-point source pollution in hilly and mountainous areas, effectively control the non-point source pollution of farmland in hilly areas, and can slow down the soil and water loss of farmland in hilly and mountainous areas. Years can be used as farmland fertilizer, which has good environmental and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of agricultural environmental protection, and in particular relates to a method for preventing and controlling agricultural non-point source pollution in hilly and mountainous areas by using nitrogen and phosphorus intercepting ditches. Background technique [0002] In recent years, agricultural non-point source pollution has increasingly become an important source of eutrophication in lake water. my country is a large agricultural country. Sloping farmland resources in mountainous, hilly and plateau areas account for more than half of the total cultivated land area. A large amount of nitrogen and phosphorus is input into lakes and reservoirs through water and soil loss every year, which aggravates the risk of agricultural non-point source pollution. Therefore, exploring effective prevention and control measures for agricultural non-point source pollution in mountainous and hilly areas is extremely important...

AI Technical Summary

Problems solved by technology

At present, ecological prevention and control technologies such as hedgerows, front-end reservoirs, and constructed wetlands are mainly used. The characteristics of these technologies are to use engineering interception or plant absorption to prevent water, soil, and N, P and other pollutants from entering the water body. However, most of them occupy a lot of cultivated land. In the hilly area, the mountains are high and the slopes are steep, and the conflict between people and land is sharp, so it is difficult to promote

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