Method for reducing nitrogen and phosphorus non-point source pollution of dry land

Abstract

The invention discloses a method for reducing nitrogen and phosphorus non-point source pollution of dry land, which comprises the following steps: firstly, taking FGD (Flue Gas Desulfurization) gypsum for fastening excessive phosphorus of dry land soil, thereby reducing runoff loss of soluble phosphorus and realizing the emission reduction for the in-situ phosphorus in a farmland; secondly, constructing a channel pond wetland system and performing biological fixation and efficient nitrogen and phosphorus removal; and lastly, fertilizing wetland plants and returning to the field, thereby reducing the investment of chemical fertilizer soluble nitrogen and phosphorus. According to the method, the resisting control is simultaneously performed at three aspects of generating process, period after running off and pollution source, so that the purpose of controlling the nitrogen and phosphorus pollution of the dry land is achieved. According to the method provided by the invention, the in-situ emission reduction for the phosphorus in the soil, the aquatic plant wetland adsorption and the organic fertilizer replacing local chemical fertilizer are combined, and the non-point source pollution of the dry land is simultaneously resisted and controlled at the three aspects of generating process, period after running off and pollution source, so that the purpose of effectively preventing and controlling the nitrogen and phosphorus pollution of the farmland is achieved, the recycling for the waste resources is realized, and the method has extensive application prospect.

Description

technical field [0001] The invention belongs to the technical field of agricultural resources and environmental protection, and specifically relates to farmland nutrient emission reduction and aquatic plant cultivation technology. This technology is suitable for dry land, especially vegetable fields and seedling production bases with high fertilizer application. Background technique [0002] In recent years, with the improvement of people's living standards, people's demand for food has further increased. Under the condition of limited arable land in our country, to obtain higher crop yield, we can only rely on higher chemical fertilizer input. At present, my country's chemical fertilizer application is close to 1 / 3 of the world's total, while the cultivated land only accounts for 1 / 7 of the world's total. Especially in dry land, the amount of chemical fertilizer input per unit area is larger. In some areas, the amount of chemical fertilizer input for vegetables such as to...

AI Technical Summary

Problems solved by technology

By reducing the input of chemical fertilizers, the loss of nitrogen and phosphorus in runoff can be effectively reduced, but it often leads to crop yield reduction

The use of constructed wetlands to control agricultural non-point source pollution can obtain better nitrogen and phosphorus removal effects, but it occupies a large area, and it is difficult to further promote it in the case of limited land resources in our country.

Although the ecological ditches have achieved some control effects on the reduction of nitrogen and phosphorus in the water body, the removal effect on phosphorus is poor, and the ditches need to be cleaned and dredged daily, and the maintenance is more complicated

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