Saline-alkali land improving and greening method

Abstract

The invention discloses a saline-alkali land improving and greening method, and belongs to the technical field of saline-alkali land improvement. The method comprises the following steps: arrangementof a salt drainage ditch: determining the depth, width and direction of the salt drainage ditch according to the depth of soil needing improvement and the depth of groundwater; burying of a salt drainage device: firstly, laying gravel in the salt drainage ditch, then laying a leakage net, laying a salt drainage pipe on the gravel and the leakage net, laying gravel on the leakage net after the saltdrainage pipe is wrapped by the leakage net, and then filling and leveling up the salt drainage ditch; deep ploughing: ploughing to the degree of finely broken soil, and allowing no obvious large soil to exist; field soaking: repeatedly storing water and soaking until no large number of salt crystals exist; improved soil replacement: laying good soil with 25 cm or more; salt and / or alkali tolerant plant planting; and straw returning to field: improving for a period of time, selecting crops and plants, intercropping, and returning crop straw to the field. The saline-alkali land improving and greening method disclosed by the invention can improve the saline-alkali land to be used for agricultural production.

Description

technical field [0001] The invention relates to the technical field of saline-alkali land improvement, in particular to a greening method for saline-alkali land improvement. 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. Soil salinization is a worldwide problem. Agricultural land due to salinization has reduced production and abandoned cultivated land for nearly 5 million mu, mainly concentrated in the arid and semi-arid regions of North China, Northwest and Northeast China. In addition, during the cultivation process, the long-term excessive application of chemical fertilizers leads to the intensification of secondary salinization of the soil, serious compaction, and the continuous expansion of salinized and alkalized soil. In addition, my country has more than 18,000 kilometers of long continental coastlines, such as the Bohai Sea, the Yellow Sea, and the ...

AI Technical Summary

Problems solved by technology

The above methods have played an important role in improving saline-alkali land and agricultural production and brought great benefits, but there are various defects in the single saline-alkali soil improvement method.

For example, biological improvement is to use organisms (plants or microorganisms) to fix or absorb the salt in the soil in plants, but the fixed or absorbed salt still exists in this soil area, and if there are no follow-up measures, it will lead to secondary soil growth at any time. The risk of salinization; physical improvement is to use deep plowing, loose soil, etc. to increase the porosity of the soil, which is conducive to the removal of salt, but if there is no chemical improvement method (ion replacement), it is difficult to remove the salt ions adsorbed by the soil colloid In addition, the effect of loosening the soil is relatively short-lived

[0005] Therefore, effective saline-alkali soil improvement is usually a combination of more than one improvement method, and one improvement method alone usually faces problems such as incomplete improvement or secondary salinization.