A method for preventing and controlling the loss of nitrogen and phosphorus in sloping cultivated land

Abstract

The invention concretely discloses a slope cropland nitrogen and phosphorus loss preventing and control method, which comprises the steps that (1) a plurality of transverse ditches which are arranged at equal distance and are in sequential end-to-end connection are dug along the slope surface of slope cropland; (2) the transverse ditches are sequentially filled with charcoal, middle layer soil, charcoal and surface layer soil from bottom to top; a headrace is formed at the upper parts of the transverse ditches; an irrigation water seepage pipe network is buried in the middle layer soil; (3) one or a plurality of water seepage wells are dug in each transverse ditch; (4) plant hedges are planted in the surface layer soil for intercepting mud sand and runoff; (5) a filtering ditch is then dug along the bottom of the slope surface of the slope cropland; the filtering ditch is filled with a charcoal layer; a flow guide pipe is buried in the charcoal layer; (6) plant hedges used for maintaining the surface layer soil in a temporary storage ditch of water to be filtered are planted in the temporary storage ditch of the water to be filtered. The method has the advantages that the nitrogen and phosphorus loss can be well prevented and controlled; the non-point source pollution of agricultural fertilizers is avoided; meanwhile, water seepage irrigation on crops during the drought can also be realized.

Description

technical field [0001] The invention relates to the field of agricultural ecological environment protection, in particular to a method for preventing and controlling the loss of nitrogen and phosphorus in sloping cultivated land. Background technique [0002] Sloping cultivated land refers to the dry land distributed on hillsides with poor ground flatness, prominent problems of running water, fertilizer and soil, and low crop yields. my country's sloping cultivated land is about 359 million mu, accounting for nearly 1 / 5 of the national cultivated land area. The loss of soil nutrients in sloping cultivated land is due to the rainfall acting on the surface soil, and the runoff causes the dissolution and loss of nutrients such as nitrogen and phosphorus in the soil, or the process that the granular nutrients contained and adsorbed in the runoff sediment migrate with the runoff and enter the water body. Due to the inclination of sloping farmland, runoff that moves along the slo...

AI Technical Summary

Problems solved by technology

[0006] At present, most researchers apply biochar evenly to the soil, which can improve soil, increase fertilizer efficiency, and increase soil organic matter content. Soil surface plays little role in controlling nitrogen and phosphorus loss

Some people also bury biochar and soil under a certain proportion of agricultural non-point source polluted sewage collection ditches, but it is not practical on slope farmland with small plots, and no plants are planted to absorb the nitrogen and phosphorus accumulated in biochar. Make biochar non-reusable

[0007] In addition, due to the poor water storage capacity of sloping farmland, it is difficult for the crops growing on it to obtain enough water for growth when the rain is scarce.

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