Method for retarding salt surface accumulation in saline-alkali land of Yellow River irrigation district

Abstract

The invention discloses a method for retarding salt surface accumulation in a saline-alkali land of the Yellow River irrigation district and belongs to the technical field of soil improvement of saline-alkali lands. The method comprises the steps that a salt-reduction isolating layer is paved; animal rotten feces and saw timber powder are applied on the land surface; ploughing and irrigation are conducted to the surface of the saline-alkali land; a cofferdam, trapezoid soil heaps and inversed trapezoid grooves are trimmed; drip irrigation pipes are embedded; punching and applying of soil fertility fertilizers are carried out; and management of drip irrigation pipes is carried out. The method disclosed by the invention has the advantages that operations are simple; a soil water holding capacity is increased; nutrients are kept; soil looseness is enhanced; a soil hardening degree is improved; the ability of collecting rainwater and irrigation water is enhanced; soluble salt ions in the saline-alkali land soil can be rapidly leached into a plough layer, so that alleviation of the soil and nutrients on the surface layer does not take place easily; and polyacrylamide irrigation is adopted during different periods, so that the salt ions leached to deep soil layers are not easily delivered to the superficial layer soil with water, the salt surface accumulation can be retarded and the salt content can be reduced.

Description

technical field [0001] The invention relates to a method for slowing down the surface accumulation of salt in saline-alkali land in the Yellow River irrigation area, 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 a...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for slowing down the surface accumulation of salt in saline-alkali land in the Yellow River irrigation area in order to solve the problems in the current saline-alkali land improvement technology that the effect of salt discharge and salt reduction on saline-alkali land is not obvious, and the technology is complicated.