Method of water seepage and salt drainage in salt and alkali shoal land

Abstract

A method of water seepage and salt drainage in salt and alkali shoal land comprises following steps: 1) land leveling, deep ditches which are 26 to 60 cm deep are dug with intervals of 0.4 to 8 meters; the deep ditches are one-way parallel ditches, or parallel ditches which are crossed in length and breadth with different density vertically and horizontally, a layer of sand which is 3 to 37 cm thick is laid at the bottom of the deep ditches to form underground alkali discharge sand ditches; 2) underground salt discharge pipes laying; 3) underground irrigation pipes laying; 4) deep scarification and knot breaking; 5) fresh water flooding irrigation; 6) salt water enhanced drainage: while fresh water flooding irrigation is being carried out, one ends of the underground salt discharge pipes are sealed with sealing plugs and the other ends are connected with water pumps to perform enhanced drainage on salt water leached to the underground salt discharge pipes; the leached salt water is drained to salt discharge ditches; 7) continuous irrigation and drainage: the fresh water flooding irrigation and the salt water enhanced drainage are repeated carrying out to quickly leach the salinity in the soil; when the salinity in the soil decreases to an expected target, irrigation and drainage are stopped.

Description

technical field [0001] The invention relates to an alkali discharge system, in particular to a method for seepage and salt discharge in a saline-alkali flat. Background technique [0002] Saline-alkali land is a huge potential resource, and the development and utilization of saline-alkali land is one of the important measures to expand the area of ​​cultivated land and further develop agricultural production. There are about 1.5 billion mu of various saline soils in my country, accounting for 26.3% of the world's saline soil area. The area of ​​saline-alkali land in coastal and inland areas is relatively large, and most of the saline-alkali land has been waiting for development. In particular, heavy saline-alkali coastal areas have high groundwater levels, high soil salinity, soil compaction, low soil fertility, and poor air permeability, making it difficult to produce various economic crops. How to quickly desalinate saline-alkali land is the technical bottleneck of saline...

AI Technical Summary

Problems solved by technology

Through long-term observation by the inventors, it is found that methods 1 and 3 have the disadvantages of poor effect of alkali modification, method 2 has the disadvantages of large investment and serious loss of fertility, and method 4 has the disadvantages of large investment and ineffective effect

Above-mentioned three kinds of methods all highlight the problem that there is a long period of alkali modification