Spent bleaching earth and desulfurized gypsum based modifying agent of saline and alkaline land and modification method of saline and alkaline land

Abstract

The invention provides a spent bleaching earth and desulfurized gypsum based modifying agent and a modification method of saline and alkaline land. A raw material formula of the modifying agent is prepared from 65 to 75 percent of spent bleaching earth, 0.5 to 2 percent of compound microbial inoculant, 3 to 6 percent of phytic acid, 10 to 15 percent of desulfurized gypsum and 3 to 21.5 percent of fatty alcohol-polyoxyethylene ether, wherein the compound microbial inoculant is a mixture prepared from bacillus subtilis, bacillus licheniformis, bacillus laterosporus, streptomyces jingyangensis and bacillus mucilaginosus according to the volume ratio of a culture solution, which is 1 to (1.2 to 1.6) to (0.5 to 0.7) to (1.2 to 1.5) to (0.6 to 0.9). By adopting the modifying agent provided by the invention and combining the modification method provided by the invention, the modification of the saline and alkaline land, particularly heavy metal polluted saline and alkaline land, can be effectively realized; the control requirements of the saline and alkaline land are met fundamentally; meanwhile, the spent bleaching earth and desulfurized gypsum based modifying agent is low in cost; the resource reutilization can be realized; the environmental pollution is decreased.

Description

technical field [0001] The invention relates to a soil improver, in particular to a saline-alkali soil improver. Background technique [0002] Soil salinization has a relatively large damage to the physical and chemical properties of the soil, which is extremely unfavorable to the growth of many crops, and it is easy to cause the lack of seedlings or death of crops, thus hindering the development of agricultural economy. Due to the high salt content, low organic mass, and high pH in saline-alkali land, the soil humus is leached and the soil structure is damaged. It is sticky when wet and hard when dry. There are often white salt deposits on the soil surface, and poor ventilation and water permeability. Severe cases can cause plant wilting, poisoning and root rot to die. In addition, if the soil is too alkaline, it will affect the availability of nutrients such as phosphorus, iron, manganese, boron, and zinc in the soil, and will easily cause a large amount of nitrogen, phos...

AI Technical Summary

Problems solved by technology

The patented formula is complex, inconvenient to produce, a large amount of nutrients needed for microbial growth are added, and the cost is high, and in the hardened environment of saline-alkali land, the growth and reproduction of microorganisms are limited, and the treatment effect is not good

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