Soil pollution remediation and soil fertility improvement method based on smash-ridging tillage

Abstract

A soil pollution remediation and soil fertility improvement method based on smash-ridging tillage comprises the steps that (1) deep ditches are dug in the periphery of a cultivated land to form a drainage system, and the requirement for drainage and irrigation is met; (2) smash-ridging tillageof the cultivated land: the first smash-ridging tillage depth is 40 cm or above, the rice field depth is 25 cm or above, green manure is sown every time after smash-ridging tillage is conducted, and smash-ridging tillage is conducted every 2-3 months in combination with green manure returning and dressing; (3) dry and wet alternate moisture management is carried out according to weather conditions such as rainy seasons after each time of smash-ridging tillage, so that harmful substances such as residual heavy metals and pesticides in the soil move downwards to the bottom layer from the upper layer of the plowing layer, full-field water storage is carried out by utilizing rain in the rainy seasons,and the water is quickly discharged outwards through a drainage system; and (4) ridge smashing and green manure planting are carried out alternately 2-3 times in the year, and crops can be planted after the second year. According to the method, low-cost soil pollution remediation and soil fertility fertilization are achieved through smash-ridging tillage.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for quickly loosening and discharging soil based on powder ridge farming for soil pollution remediation and soil fertilization. Background technique [0002] With the continuous development of my country's industry and urbanization, the problem of soil heavy metal pollution caused by industrial and domestic wastewater discharge, sewage irrigation and excessive use of chemical fertilizers and pesticides has become increasingly serious. Sources of soil heavy metal pollution include metal mining and smelting, chemical industry production, heavy metal pesticides, sewage irrigation and chemical fertilizer application, and high geological background values. The dissolution and diffusion of solid waste into the soil is the main way of heavy metal pollution. According to Luo Xiwen, an academician of the Chinese Academy of Engineering, about 300 million mu of arable lan...

AI Technical Summary

Problems solved by technology

The excessive use of chemical fertilizers and pesticides makes the soil rich in salinity, and the number and amount of microbial communities in the soil are greatly reduced, resulting in poor soil permeability, soil compaction, reduced colloids, difficult cultivation, and greatly reduced fertilizer retention capacity. The acid-base response of the soil is out of balance

2. The phenomenon of shallow soil cultivation is intensified, the oxidation-reduction potential decreases, and the toxic substances increase

Soil or secondary gleization, with green interlayer and poor permeability; or low maturity, poor fertility and lack of nutrition

4. Mineral Toxic Pollution Hazards

"However, planting plants that do not enter the food chain is the most feasible, but it does not match the modern farming model that maximizes economic benefits, and it is difficult to achieve in a short period of time; the cost of adding organic fertilizers and soil conditioners that passivate heavy metals is high and requires The continuous use of crops in each season will have better results, which is not enough for the current development of China's agriculture to meet this demand

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