Effective method for improving saline-alkali soil through physical and biological combination

Abstract

The invention provides an effective method for improving saline-alkali soil through physical and biological combination. The method comprises the following steps that S1, the saline-alkali soil is deeply ploughed and loosened; S2, the saline-alkali soil is flattened, water storage and field steeping are conducted around a dam, and salt is washed through fresh water; S3, soil replacement is conducted on the saline-alkali soil, wherein newly-added soil is a manually-prepared special soil matrix; S4, biological organic fertilizer is applied to the saline-alkali soil; S5, the saline-alkali soil isimproved through a biological technology; S6, salt-resistant crop sweet sorghum is planted on the saline-alkali soil; S7, water and fertilizer management of improved planting of sweet sorghum on thesaline-alkali soil is conducted; S8, the steps above are repeated in two successive years, after sweet sorghum is planted in the third year, the saline-alkali soil is improved. According to the effective method, two years after sweet sorghum is planted on the saline-alkali soil, the soil salt content of the saline-alkali soil can be lowered from 0.3-0.6% to about 0.125%, and the organic matter isincreased from 0.7% to about 2.23%; 3 years after sweet sorghum is planted, the soil salt content of the saline-alkali soil can be lowered to a normal cultivated land level, the saline-alkali soil becomes desalted soil, and the saline-alkali soil is successfully improved.

Description

technical field [0001] The invention relates to an effective method for improving saline-alkali land by combining physics and biology. Background technique [0002] Saline-alkali land, as the name suggests, is land with high saline-alkali content, which is not suitable for growing common crops or most plants. The formation of saline-alkali land is related to the high content of "carbonate" in the soil. In saline-alkali land, the ground temperature is generally relatively low. In order to inhibit the return of salt and accelerate the decomposition of nutrients, the soil capillary can be cut off, and the salinity can be washed by volt plowing or autumn plowing, which can effectively control the return of salt in the soil. Deep plowing and deep plowing can loosen the cultivated layer and the characteristics of poor soil structure. , so it is worth promoting. The distribution of salt in the soil is more on the surface and less underground. Salt washing is to pour water into the...

AI Technical Summary

Problems solved by technology

[0005] Saline-alkali soil improvement is divided into three types: physical improvement, biological improvement and chemical improvement.