Method for controlling salt up-going and soil surface accumulation of secondary salinization land

Abstract

The invention discloses a method for controlling salt up-going and soil surface accumulation of a secondary salinization land, and belongs to the technical field of improvement of soil of saline-alkali lands. The method comprises the following steps: selecting land and burying salt discharging tubes; applying composting animal manure, sawmilling powder and desulfurized gypsum powder on earth's surface; turning over and irrigating the earth's surface of a saline-alkali land; applying a base fertilizer; trimming cofferdams, trapezoidal mounds and inverted-trapezoid-shaped furrows; forming holes and applying soil fertility fertilizers; covering the land with films; covering, seeding in a good time and irrigating; and managing the salt discharging tube. The method is simple to operate, water storage capability of soil can be improved, nutrient is maintained, loosenness of the soil is improved, hardening degree of the soil is also improved, water retention, fertilizer retention and warming are facilitated, soluble salt ions can be quickly leached below a plough layer, so that irrigation water becomes clear, and the soil and the nutrient of a surface layer cannot be alluvial easily; and by total film covering, soil salinity can be stopped from being accumulated to the surface layer of the soil, the salt ions which are leached to the deep layer of the soil cannot be transferred to the soil of the surface layer along with water, and salt soil surface accumulation of the saline-alkali land is controlled effectively.

Description

technical field [0001] The invention relates to a method for controlling the upward surface accumulation of salt in secondary saline-alkali land, and belongs to the technical field of saline-alkali soil improvement. Background technique [0002] China currently has 100 million hectares of saline-alkali land, most of which are distributed in arid and semi-arid regions such as North China, Northwest and Northeast China, mainly including Xinjiang, Qinghai, Gansu, Ningxia, Shaanxi, Inner Mongolia, and northeast Shanxi. Most of them belong to the Yellow River system, and the groundwater level is significantly affected by the Yellow River system. The groundwater level is high. The local drinking wells are generally around 20m, and the groundwater level is around 2m. The main soil types are saline soil and aeolian sand, which are developed on the parent material of aeolian sand. The juvenile soil contains a lot of soluble salts, the rainfall is low, the annual average is about 180m...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for controlling the upward surface accumulation of salt in secondary saline-alkali land in order to solve the problem of soil secondary salinization caused by soil water evaporation loss in saline-alkali land