Method for controlling nitrogen and phosphorous non-point source pollution of cropland by using biological ridge
A non-point source pollution and biological field ridge technology, applied in the field of controlling nitrogen and phosphorus non-point source pollution in farmland, can solve the problem of few control methods, and achieve the effects of reducing the risk of nitrogen and phosphorus pollution, obvious soil fixing effect and easy operation.
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[0040] Take the farmland of a certain city as an example: select the farmland with main ridge, branch ridge and hair ridge, and use these three kinds of ridges as the boundary to enclose the farmland into an area of 3000m 2 2 closed areas of different sizes, the closed area is 60m long and 50m wide, each area has a water inlet to allow irrigation water to flow into the farmland, and a water outlet to monitor the drainage and pollutant discharge of the farmland. One of the areas does not make any artificial transformation, and keeps the original field ridge as a control treatment; the other area transforms the field ridge into a biological field ridge according to the biological ridge construction method of the present invention, and studies its implementation effect.
[0041] In the construction process of the biological field ridge, the width of the main ridge in this embodiment is 2m, the width of the branch ridge is 80cm, and the width of the hair ridge is 40cm. The ridge...
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