Improvement method for soil of saline and alkaline land

Abstract

The invention relates to an improvement method for soil of a saline and alkaline land. The improvement method mainly comprises the following treatment steps of: carrying out on-site investigation on a plot to be improved; taking a water sample; carrying out soil sample analysis; carrying out water sample analysis; designing an improving scheme; carrying out an indoor leaching test: fully mixing and stirring a soil bulking agent, a chemical amendment and raw soil, filling a soil column with the mixture and watering the soil column to conduct a leaching experiment, wherein the soil bulking agent is added in an amount of 5-20% by volume of the saline-alkaline soil; the chemical amendment is added in an amount of 0.5kg / m2 to 5kg / m2 based on the volume fo the saline-alkaline soil; uniformly stirring the soil bulking agent, the chemical amendment and the saline and alkaline soil according to the ratio; setting a salt eliminating trench; burying a salt eliminating device; carrying out water irrigation and salt elimination; and testing the physical and chemical indexes of leaching water and soil. The invention provides the improvement method for soil of the saline and alkaline land. On the premise of not replacing soil, by virtue of adding the saline and alkaline soil amendment and after operations of engineering stirring and water irrigation and salt elimination, the saline and alkaline land is thoroughly improved, so that the saline and alkaline land can be used for agricultural production or afforestation of city.

Description

technical field [0001] The invention belongs to the field of soil improvement, in particular to a soil improvement method in saline-alkali land. 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. The saline-alkali soil area in the world is about 1 billion hectares. my country has 99.13 million hectares, or about 1.47 billion mu. More than 100 cities in the country are located in saline-alkali soil distribution areas. Nearly 500 million mu of land has been reduced or abandoned due to salinization, mainly concentrated in the arid and semi-arid regions of North China, Northwest China 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...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcoming that a single method in the prior art cannot effectively improve saline-alkali soil, and provide a method for improving saline-alkali soil. After mixing, irrigation and salt discharge operations, the saline-alkali soil can be thoroughly improved so that it can be used for agricultural production or urban greening

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