Method for reducing non-point source pollutants of farmland

A pollutant and farmland technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., can solve the problems of farmland non-point source pollution, nitrogen and phosphorus loss, etc., to achieve appropriate water flow and reduce nitrogen Phosphorus loss, effect of increasing settling and adsorption absorption time

Pending Publication Date: 2017-08-18
GUANGXI COLLEGE OF WATER RESOURCES & ELECTRIC POWER
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  • Application Information

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Problems solved by technology

Among them, the main cause of water pollutants is that nitrogen and phosphorus fertilizers are not effectively absorbed by crops, resulting in the loss of nitrogen and phosphorus, and the irrigation and drainage system does not effectively treat the water discharged from the farmland.
[0003] Limitations of traditional irrigation and drainage systems: Traditional irrigati

Method used

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  • Method for reducing non-point source pollutants of farmland
  • Method for reducing non-point source pollutants of farmland

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Experimental program
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Effect test

Embodiment 1

[0029] A method for reducing farmland non-point source pollutants, comprising the following steps:

[0030] S1. Irrigation method: reduce the loss of nitrogen and phosphorus in the farmland by using intermittent irrigation; fertilization method: four times of nitrogen fertilizer application, the base fertilizer is applied to 30% of the total weight of nitrogen fertilizer, and nitrogen fertilizer is applied 10 to 12 days after transplanting 30% of the total weight is used as tillering fertilizer, 30% of the total weight of nitrogen fertilizer is applied as jointing fertilizer 35 to 40 days after transplanting, and 30% of the total weight of nitrogen fertilizer is applied as 10% ear fertilizer after 60 to 65 days of transplanting. That is, the 4th nitrogen fertilization ratio is 3:3:3:1.

[0031] S2. The water discharged from the farmland flows into the drainage grass ditch. The vertical section of the drainage grass ditch is trapezoidal, with an upper bottom of 0.3m, a lower bo...

Embodiment 2

[0084] The steps of S1, S2, and S4 in this embodiment are the same as those in Embodiment 1, and only another processing is performed on the step of S3.

[0085] The pond weir wetland is divided into 4 connected parts of No. 1 pond weir, No. 2 pond weir, No. 3 pond weir and No. 4 pond weir; No. 1 pond weir and No. 3 pond weir part are water inflowed from the upper part and water out from the lower part, and floating leaf plants are planted , one or more of submerged plants, floating plants, and vegetables floating on the water surface using soilless culture; No. 2 pond weir part and No. 4 pond weir part enter water from the bottom, and water comes out from the top, planting emergent plants; floating leaves Plants include water lilies, submerged plants include black algae and foxtail algae; floating plants include water hyacinth; vegetables include water spinach, watercress, and lettuce; emergent plants include reeds and reeds.

[0086] Planting method: Water lilies, reeds, and...

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Abstract

The invention discloses a method for reducing non-point source pollutants of a farmland. The method comprises the following steps: S1, reducing nitrogen and phosphorus loss of the farmland through adopting a manner of combining intermittent irrigation and split application; S2, enabling water drained from the farmland to flow into an optimized water drainage grass ditch and filtering; S3, enabling water drained from the water drainage grass ditch to flow into a pond wetland and precipitating and absorbing the pollutants by water plants; S4, enabling water drained from the pond wetland to flow into a backbone ecological ditch and purifying the water drained from the wetland again.

Description

technical field [0001] The invention relates to the technical field of reducing agricultural discharge pollutants, in particular to a method for reducing farmland non-point source pollutants. Background technique [0002] In recent years, excessive use of chemical fertilizers and pesticides in paddy fields not only results in low utilization rates, but also results in a large amount of nitrogen, phosphorus and other elements lost with paddy field drainage, resulting in serious agricultural non-point source pollution. The time and space of fixed and pollution loads vary greatly, and the difficulty and cost of pollution control and governance are relatively large, which has become the number one environmental governance problem. my country's "1st National Pollution Source Survey Bulletin in 2010" shows that in 2007, the total nitrogen and total phosphorus emissions from agriculture accounted for 57.2% and 67.4% of the total pollutant emissions. It can be seen that agricultural...

Claims

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Application Information

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IPC IPC(8): C02F3/32
CPCC02F3/32C02F3/325C02F2209/16C02F2209/08Y02W10/10
Inventor 万玉文茆智李新建崔远来粟世华余金凤赵树君甘幸魏保兴黄绘郭长强方崇潘乐
Owner GUANGXI COLLEGE OF WATER RESOURCES & ELECTRIC POWER
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