Drainage method of salt-alkali soil

Abstract

The invention discloses a drainage method of salt-alkali soil. The method includes the steps of spreading a hydrophobic membrane at the position, which is 25-55 cm deep, of a salt-alkali soil layer, wherein a drainage net pipe is arranged above the hydrophobic membrane and is composed of a plurality of transverse drainage pipes and a plurality of longitudinal drainage pipes which are perpendicular to each other, the transverse drainage pipes and the longitudinal drainage pipes which intersect are in fluid communication, a water inlet and a water outlet are formed in the drainage net pipe, seepage holes are formed in pipe bodies of the transverse drainage pipes and the longitudinal drainage pipes, a water suction pump is arranged at the water outlet, and a water inlet of the water suction pump is in fluid communication with the water outlet; when rain stops or irrigation and drainage are stopped, starting the water suction pump to suck water so that water of the soil layer above the hydrophobic membrane can enter the drainage net pipe through the seepage holes so as to be drained out of the drainage net pipe. By means of the method, water is saved, and the salt content of the upper soil layer of salt-alkali soil can be kept balanced.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a method for draining saline-alkali soil. Background technique [0002] Saline-alkali land is a type of salt accumulation, which means that the salt contained in the soil affects the normal growth of crops. According to the incomplete statistics of UNESCO and FAO, the area of ​​saline-alkali land in the world is 954.38 million hectares, of which my country is the largest 99.13 million hectares. The formation of alkaline soil and alkalized soil in my country is mostly related to the accumulation of carbonate in the soil, so the degree of alkalization is generally high, and plants in severe saline-alkali soil areas can hardly survive. [0003] Saline-alkali land is generally removed by irrigation and drainage. There are usually two problems in the process of removing salinity. The first is that the brackish water obtained from irrigation, drainage and leaching is directly dis...

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Problems solved by technology

[0003] Saline-alkali land is generally removed by irrigation and drainage. There are usually two problems in the process of removing salinity. The first is that the brackish water obtained from irrigation, drainage and leaching is directly discharged, which is likely to cause secondary salinization of the nearby soil. After the rain, the salinity in the saline-alkali underground layer will go to the upper layer of the soil with the evaporation of rainwater, so that the salt content of the upper layer of the saline-alkali soil will increase

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