Method for producing and restoring vegetables growing in the heavy metal mildly-polluted soil

Abstract

The invention relates to a technique of remediation of slightly and medio- metal-contaminated vegetable soil with production. The specific steps are as follows: firstly, Sedum alfredii and Elsholtzia splendens are intercropped in vegetable soil contaminated by heavy metal such as cadmium, copper and zinc in spring with a with inter plant distance of ten to fifteen centimeters, row spacing of thirty centimeters; secondly, the Sedum alfredii is harvested periodically, a growth period of Sedum alfredii is three to four months during a first harvest, from then on, the Sedum alfredii is harvested every three months or when growing to a height of thirty to forty centimeters, stems of a height of two to three centimeters are left above the ground in harvest; the Elsholtzia splendens is harvested in October; thirdly, a cadmium-enriched rape is planted after the harvest of the Elsholtzia splendens with the spacing in the row of fifteen to twenty centimeters and is harvested in April of the next year; fourthly, a cucumber is planted after the harvest of the rape with the spacing in the row of twenty to twenty-five centimeters, a cabbage is planted after the harvest of the cucumber in September, the Elsholtzia splendens is planted after the harvest of the cabbage, then a restoring period is completed. Adopting a super accumulator plant for absorbing a plurality of heavy metal from the soil, the invention achieves reducing the heavy metal content in the vegetables and guaranteeing the safety of the farm produce.

Description

technical field [0001] The invention relates to a method for repairing vegetable field soil slightly polluted by heavy metals while producing, and belongs to the technical field of polluted soil treatment. Background technique [0002] At present, the relatively mature physical and chemical technologies used for remediation of heavy metal pollution in soil include: guest soil, soil upturning technology, leaching technology, heat treatment technology, electrolysis technology, and curing technology. The above-mentioned physical and chemical remediation technologies each have their own advantages, but they all have large engineering volumes, high costs, and difficulty in large-scale improvement of contaminated soil. At the same time, they are likely to cause secondary pollution, damage to soil structure, decrease in soil activity, and degradation of soil fertility, etc. ecological problem. Phytoremediation (phytoremediation) is a new technology that can not only achieve the go...

AI Technical Summary

Problems solved by technology

At present, heavy metal pollution in soil is becoming more and more serious in our country, and it is unrealistic to stop farming in a large area of ​​farmland slightly polluted by heavy metals and carry out long-term plant or engineering restoration.

On the one hand, there are risks in cultivation management, on the other hand, it affects normal agricultural production and farmers' income

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