Composite improvement method for saline and alkaline land

Abstract

The invention discloses a composite improvement method for a saline and alkaline land. The method specifically comprises the following steps: laying concealed conduits; performing mixed coal cinder salt washing; laying crushed plant straw in soil of a salt washed saline and alkaline land; uniformly throwing a mixture of biological bacterial agents and urea, and performing deep ploughing, turning and burying; applying a multi-stage porous carbon material, an acrylic acid-2-acrylamide-2-methallyl sulfonate copolymer, a nano humic acid-based composite resin, an inorganic fertilizer, humic acid and an excrement fertilizer into each mu of deeply ploughed, turned and buried soil of the saline and alkaline land, and uniformly mixing the inorganic fertilizer, the humic acid and the excrement fertilizer into a ploughing layer by using a rotary cultivator; performing three years of planting of salt-resistant alfalfa after domestication culture in the treated soil of the saline and alkaline land,and further planting crops such as wheat or corn. By adopting the method, salt contents in the soil can be effectively reduced, the fertility of the soil of the saline and alkaline land can be improved, and the physical and chemical properties of the soil of the saline and alkaline land can be improved.

Description

technical field [0001] The invention relates to the field of saline-alkali land improvement, in particular to a compound improvement method for saline-alkali land. Background technique [0002] With the development of my country's economy and urbanization, the area of ​​arable land is continuously decreasing, and food supply is facing serious challenges. At the same time, the continuous salinization of soil is an important factor that threatens the sustainable development of agriculture and the stability of ecosystems. Saline-alkali soil has a negative impact on crop production and the physical, chemical, and biological properties of the soil. The pH value is high, the soil is alkaline, the organic matter content is low, the soil fertility is low, the physical and chemical properties are poor, and the water and air permeability are poor. significantly reduced to the point where crops cannot even grow. my country has 1.5 billion mu, of which 280 million mu of saline-alkali l...

AI Technical Summary

Problems solved by technology

[0003] The existing technology of flushing salt in underground pipes can reduce soil salinity, but it requires a large amount of water resources for irrigation every year. There are many types of saline-alkali soils with poor water permeability, which cannot quickly reduce salinity, or even fail to achieve the effect of reducing salinity.

It is difficult to wash and maintain the salt in the later stage of water shortage areas, and it is easy to return to the salt. At the same time, the content of organic matter in saline-alkali land is low, and the soil fertility is low. Frequent water washing will take away soil nutrients and organic matter, which is not conducive to the improvement of the soil structure and fertility of the plow layer.

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