Method for comprehensively treating saline-alkali soil

Abstract

The invention relates to the technical field of saline-alkali soil treatment, in particular to a method for comprehensively treating saline-alkali soil. The method comprises the following steps of S1,engineering treatment, namely establishing a modern drainage system; S2, agricultural measures, namely including tillage, soil dressing, fertilization, sowing, crop rotation, intercropping, interplanting and rice planting; S3, biological measures, namely including salt-tolerant crop planting, green manure forage grass planting and afforestation; and S4, chemical measures, namely in the treatmentprocess, insisting on the basis of drainage, comprehensively treating the relationship of drainage, irrigation, storage and supplementation, correctly selecting the critical depth of an underground water level, performing irrigating in the drought period, performing draining in the waterlogging period, controlling the underground water level in the period of salt return, and supplementing a watersource after the underground water level is lowered due to the fact that the water source is filled, so that regional water-salt movement can be in a good state so as to achieve the aim of improving the soil. Engineering measures and various measures such as agriculture and biology are closely combined, a good farmland ecosystem of water, fertilizer, gas and heat necessary for crop growth is established according to local conditions, and the purposes of improving soil fertility and increasing agricultural yield are achieved.

Description

technical field [0001] The invention relates to the technical field of controlling saline-alkali soil, in particular to a method for comprehensively controlling saline-alkali soil. Background technique [0002] Saline-alkali land is formed by the comprehensive influence of climate, hydrogeology, terrain and other natural conditions in arid, semi-arid and coastal areas. In arid and semi-arid areas, due to strong ground evaporation, in places where the terrain is gentle, the surface runoff is not drained smoothly, and the groundwater is buried deep, the soluble salt in the soil-forming parent material moves with the water and accumulates in the topsoil layer under the action of evaporation, causing the land to produce salinization phenomenon. In the coastal areas, various coastal salinized lands with different degrees of salinization will also be formed due to seawater intrusion and immersion. [0003] The soil in saline-alkali land includes saline soil, alkaline soil, and v...

AI Technical Summary

Problems solved by technology

The process of increasing soil exchangeable sodium ions is called soil alkalization. Because the salinized soil contains a lot of soluble salt, it hinders the root system of crops from absorbing water, affects the survival and growth of crops, and in severe cases leads to lack of seedlings, broken ridges or withering; alkaline soil due to alkali It has strong toxicity, has poisonous effect on the root system of crops, and deteriorates the physical and chemical properties of the soil. In particular, nutrients such as calcium, manganese, phosphorus, and magnesium are easily fixed in strong alkaline soils, and are not easily absorbed by crops, which endangers the normal growth of crops. Therefore, a new method is proposed. A method for comprehensive control of saline-alkali soil