Drained water recycling and nitrogen and phosphorus cascaded percolation, blocking and removal system for paddy field on southern gentle slope land and application method of system

Abstract

The invention discloses a drained water recycling and nitrogen and phosphorus cascaded percolation, blocking and removal system for a paddy field on a southern gentle slope land and an application method of the system. The system comprises a paddy field irrigation and percolation system, a trench nitrogen and phosphorus blocking and removal system, a cascaded paddy field drained water reinjection and use system and a pond water storage ecological wet land treatment system. A farmland percolation system is arranged in the paddy field; paddy field ground drained water is gathered into water drainage farm trenches arranged along contour lines from a water outlet of a paddy gridding land; by the full use of the special topographic condition of the southern gentle slope land, all levels of paddy field pieces form cascaded distribution with a natural fall; during irrigation, water drained from the upper level of paddy field at high place enters the lower level of paddy field for reuse; in raining, rainwater which cannot be accumulated in the (upper level of) paddy field at the high place is directly gathered into percolation farm trenches for drainage; a pond is dug near to the tail end of the percolation trench of the last level of paddy field piece, and a pump station is built at the pond. The invention further discloses the application method of the system. The system is convenient to construct and small in engineering amount, and has good effects on blocking and removing nitrogen and phosphorus pollutants and efficient using of water-fertilizer cascade.

Description

technical field [0001] The invention relates to a drainage cycle utilization and nitrogen and phosphorus cascade percolation interception and removal system and application method of paddy fields on gentle slopes in southern China, and belongs to the technical category of efficient utilization of water and fertilizer in paddy fields and nitrogen and phosphorus percolation interception and removal. Background technique [0002] The gentle slope area in the south has little terrain undulation, and is distributed in areas where the slope of the terrain is below 5°. At present, the gentle slope farming in southern my country is dominant, and the main crop is rice. The irrigation system configuration mode can generally be divided into three types according to the elevation of the area: distributed in the relatively flat valley flushing field, using a small-scale water-lifting irrigation system; , the pond weir water storage irrigation system is mainly used. Due to the special t...

AI Technical Summary

Problems solved by technology

Due to the special terrain characteristics of the southern gentle slope area with abundant rainfall and developed economy, coupled with the irrational and excessive use of pesticides and chemical fertilizers in the rice production process, nitrogen and phosphorus nutrients enter the water body around the rice field through farmland rainfall, irrigation and drainage to form surface runoff, and farmland water and soil Loss and non-point source pollution are relatively serious, and the discharge of major pollutants such as COD, nitrogen, and phosphorus in farmland has exceeded 45% of the total, leading to intensified eutrophication of rivers and lakes, which has seriously affected the water environment and ecology in southern my country security, hindering the sustainable development of the economy and society

Images