Soil improvement agent for improving saline-alkali soil as well as preparation method and application of soil improvement agent

Abstract

The invention relates to a soil improvement agent for improving saline-alkali soil as well as a preparation method and application of the soil improvement agent. The preparation method comprises the following steps: (S1) crushing agricultural wastes, filtering, crushing shells to obtain shell powder, and preparing mixed liquid from the filtered agricultural wastes and the shell powder in a proportion; (S2) adding slaked lime and a superphosphate combined catalyst into the mixed liquid, and carrying out hydrothermal carbonizing treatment; (S3) cooling a hydrothermal carbonizing product, and carrying out solid-liquid separation, so as to respectively obtain a solid charcoal composite material and decomposition liquid; (S4) mixing the charcoal composite material, ardealite, egg shell, composted chicken manure, leaf mold and attapulgite, so as to obtain a mixture; and (S5) mixing the decomposition liquid with table vinegar to obtain a solution for liquid phase adjustment, adding the solution and the mixture into a disk granulating machine, and carrying out disk granulation and drying, so as to obtain the soil improvement agent. According to the soil improvement agent, the alkalinity and salt content of saline-alkali soil can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of saline-alkaline soil improvement, in particular to a soil conditioner for improving saline-alkali soil, its preparation method and application. Background technique [0002] Saline-alkali soil is an important land resource in the world, and it is widely distributed, with a total global area of ​​about 1 billion hm 2 , accounting for about 10% of the land area. The total area of ​​saline soil in my country is about 36 million hm 2 , accounting for 4.88% of the country's usable land area. In recent years, due to artificial irrational irrigation, excessive use of chemical fertilizers, deforestation, destruction of vegetation, and climate warming caused by the greenhouse effect, the problem of soil salinization has become increasingly serious. It is estimated that the saline-alkali soil in the world is 0.1-0.15 million hm per year 2 speed growth. With the increase of world population and the emergence of...

AI Technical Summary

Problems solved by technology

There are many technical measures for saline-alkali soil improvement at home and abroad, such as engineering measures for washing salt and pressing salt, biological measures for planting salt-tolerant plants and green manure, chemical measures for adding improvers to reduce salt and alkali, etc., but engineering improvements The cost of the method is relatively high, the improvement period of the biological improvement method is long, and the effect is slow

[0003] On the other hand, in the process of agricultural product processing and production, a large amount of agricultural waste such as straw, bran, wheat bran, and edible fungus residue is produced. pollute and waste resources