The method of improving saline-alkali land

Abstract

The invention discloses a method for improving saline-alkali land, which includes constructing a drainage system, and the drainage system includes a main drainage ditch and a secondary drainage ditch which is narrower and shallower than the main drainage ditch arranged between the main drainage ditch; The main drainage ditch and the secondary drainage ditch are arranged along substantially the same direction; through natural rainfall or artificial irrigation, the drainage system flushes the saline-alkali in the saline-alkali land to the river system. By reasonably setting the interval and size of the main drainage ditch and the secondary drainage ditch, the salt dissolved in the saline-alkali land can be discharged from the saline-alkali land through the drainage system in time, and the purpose of drainage and salt removal is achieved. At the same time, by reasonably setting the interval and size of the main drainage ditch and the secondary drainage ditch, the main drainage ditch and the secondary drainage ditch do not need to be repaired very densely, which greatly saves the treatment cost of constructing the drainage system.

Description

technical field [0001] The invention relates to the technical field of land management, in particular to a method for improving saline-alkali land. Background technique [0002] Declining arable land has become a worldwide problem. It is a good choice to develop coastal tidal flats and inland saline-alkali land and make full use of existing resources. The area of ​​cultivated land in our country is limited, and all kinds of coastal tidal flats and inland saline-alkali lands (because coastal tidal flats and inland saline-alkali lands are different from ordinary cultivated lands are due to their high salt content and are difficult to cultivate, so the following will be coastal tidal flats and inland saline-alkali lands. Saline-alkali land (collectively referred to as saline-alkali land) has more than 8 million mu, and the saline-alkali land with a salinity of more than 3‰ and less than 8‰, because of its high salt content, is either left unused or barely utilized, and its outp...

AI Technical Summary

Problems solved by technology

Due to the need to dig a large number of deep ditches, a lot of labor such as burying sand, digging drainage ditches, etc., requires a lot of manpower and material resources investment, which greatly increases the cost of saline-alkali land treatment, which in turn hinders the saline-alkali land treatment.

At the same time, the above method needs to fill a layer of sand with a thickness of 3-27 cm at the bottom of the opened deep ditch, which affects the normal use of the above-mentioned transformed land and brings obstacles to the later cultivation of the land.

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