Biochemical improvement method of saline-alkali soil

Abstract

The invention provides a biochemical improvement method of saline-alkali soil. The main technical scheme of the method is that sesbania is planted on the to-be-improved saline-alkali soil for one season, after the sesbania is harvested, the saline-alkali soil is deep ploughed and turned into the soil body 20cm below, the chemical improvement is carried out before planting crops or seedlings, the improvement materials consisting of turf, cured cow dung, ammonium ferrous sulfate and flue gas desulfurization gypsum according to a given proportion is applied, and the application quantity of the improvement materials is 5 to 20 percent (volume ratio) according to the salt content of the saline-alkali soil. By adopting the improvement method, the desalting effect is obvious, the cost is low, simplicity in operation can be realized, and the method is applicable to the improvement of the saline-alkali soil of farmlands and the in-situ improvement of the saline-alkali soil in garden construction. The resource of the saline-alkali soil which is difficult to use is effectively utilized, a great amount of farmland is protected, the land utilization problem of the saline-alkali soil area can be solved, the local ecological environment is improved, and a way for widely consuming the industrial and agricultural wastes can be provided in the improvement process.

Description

technical field [0001] The invention belongs to the field of saline-alkali soil improvement, in particular to the technical field of a biochemical improvement method of saline-alkali soil. Background technique [0002] Saline-alkali soil is a soil type widely distributed on the earth and is an important land resource, accounting for about 25% of the total land area, with a total of more than 1 billion hectares, mainly concentrated in Eurasia, Africa and western North America. It is estimated that the global saline-alkali soil grows at a rate of 1.0-1.5 million hectares per year, and soil salinization has become one of the important environmental problems. There are about 27 million hectares of saline-alkali land in my country, including 60 million hectares of cultivated land and 21 million hectares of saline-alkali wasteland, which are mainly distributed in the northeast, north, northwest inland areas and coastal areas north of the Yangtze River. The physical and chemical p...

AI Technical Summary

Problems solved by technology

[0003] At present, the improvement measures of saline-alkali soil in various countries in the world are mainly reflected in the following aspects: water conservancy improvement, physical improvement, chemical improvement and biological improvement. Different improvement methods have been applied in actual production, but none of them can achieve the expected results.

Either the investment is too high, or it is limited by conditions

There are also many technical patents on saline-alkali soil improvement in China. Soil improvement technicians consider various aspects, but physical improvement is often slow to take effect. Water conservancy improvement is limited by fresh water resources, and biological improvement takes a long time to be applied in agriculture and forestry. Limitation, the cost of chemical improvement is high, therefore, a simple improvement method can not solve the problem of saline-alkali soil, the present invention effectively combines biological improvement and chemical improvement, and the two methods complement each other to achieve the perfect effect of improving saline-alkali soil