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

A remediation method and heavy metal technology, applied in the restoration of polluted soil, fertilization methods, botanical equipment and methods, etc., can solve the problems affecting agricultural production and farmers' income, achieve no damage to soil physical and chemical properties, wide application range, Simple to use effects

Active Publication Date: 2009-11-04
ZHEJIANG UNIV
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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

Method used

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

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Embodiment Construction

[0018] The following examples will further illustrate the feasibility and positive effects of the method of the present invention.

[0019] A two-year restoration test was carried out in Wangxin Horticultural Farm, Jiading District, Shanghai. The heavy metal content in the soil of the horticultural field generally exceeds the standard, which belongs to moderately and lightly polluted soil. They are 0.16mg / kg, 7.08mg / kg, 5.45mg / kg and 1.64mg / kg respectively. The experiment began in March 2005, and the compound fertilizer (N:P 2 o 5 : K 2 O=15:15:15) 20kg, commercial organic fertilizer 500kg, applied with base fertilizer. In one restoration cycle, Sedum sedum was harvested 4 times with a dry matter yield of 448kg / 667m 2 , the cadmium content in the aboveground part is 22.6mg / kg, the zinc content is 5680.2mg / kg, and the lead content is 94.6mg / kg, and the cadmium, zinc and lead taken away from the soil are 10.0g / 667m 2 、2009.5g / 667m 2 and 42.1g / 667m 2 . Harvesting 1 time ...

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Abstract

The invention relates to a technology for repairing vegetable field soil slightly polluted by heavy metals while producing. The steps are as follows: 1) Intercropping Sedum sedum and Sedum haizhou in the vegetable soil polluted by heavy metals of cadmium, copper and zinc in spring, the planting density is 10-15cm, and the row spacing is 30cm; 2) Harvest Sedum sedum regularly, the first time Harvest the southeast sedum for 3-4 months of growth, and then harvest once every 3 months or when it grows to a height of 30-40cm. When harvesting, the stem above the ground is 2-3cm high; Harvest Haizhou Xiangru in October; 3) Haizhou Plant cadmium-enriched rapeseed after Harvestifolia harvested, with a plant spacing of 15-20cm, and harvest in April of the following year; 4) After rapeseed, plant cucumbers with a plant spacing of 20-25cm, plant cabbage after cucumber harvest in September, and plant Haizhou after cabbage harvest Rosacea, complete a repair cycle. The invention utilizes super-accumulating plants to take away a large amount of heavy metals from soil, thereby reducing the content of heavy metals in vegetables and ensuring the safety of agricultural products.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10A01G1/00A01C21/00C05G1/00
Inventor 杨肖娥李廷强
Owner ZHEJIANG UNIV
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