Method for repairing cadmium-polluted farmland while conducting production

A technology for cadmium pollution and farmland, applied in the field of environmental governance of polluted soil, can solve the problem of excessive cadmium in rice

Inactive Publication Date: 2020-10-30
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cadmium in farmland is easily absorbed by rice, transported and eventually accumu

Method used

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  • Method for repairing cadmium-polluted farmland while conducting production
  • Method for repairing cadmium-polluted farmland while conducting production
  • Method for repairing cadmium-polluted farmland while conducting production

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Embodiment 1

[0043] 1. Implementation location:

[0044] Lijinyuan Village, Lianhua Town, Qujiang District, Quzhou City, Zhejiang Province, the soil is red soil paddy soil with a total cadmium content of 1.07mgkg -1 , effective cadmium content 0.36mg kg -1 , exceeding the limit value for agricultural land in the Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard (GB15618-2018), which belongs to moderately polluted soil with cadmium.

[0045] 2. Test material:

[0046] Sedum sedum was provided by the super-accumulative plant seedling base of our research group. Sedum sedum plants with good growth were selected, and the terminal buds of about 8 cm were cut to the soil to be repaired by stem cuttings, and the row spacing between plants was 15 cm.

[0047] Enriched plant variety: broad bean Lingxiyicun, which is a high-quality broad bean variety with low grain accumulation and stem enrichment obtained in the laboratory's previous screening. Broad bean sowing row...

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Abstract

The invention discloses a method for repairing cadmium-polluted farmland while conducting production, belonging to the technical field of environmental management of polluted soil. The method comprises the following steps: (1) intercropping sedum alfredii hance and Lingxiyicun broad beans on to-be-remediated soil; (2) spraying a cadmium activating agent to leaves of the broad beans and the sedum alfredii hance in the seedling stage and the flowering stage of the broad beans, and completely removing straws of the broad beans and the sedum alfredii hance after harvesting; (3) leveling the soil,applying a cadmium passivation conditioner, and uniformly mixing the cadmium passivation conditioner with plough layer soil; (4) after one week, transplanting rice Zhongzheyou No.8 , carrying out flooding treatment in the whole growth period, spraying a selenium-enhanced cadmium blocking and controlling agent on leaf surfaces in the tillering period and the booting period of the rice, draining water one week before harvesting, and completely removing straws after harvesting the rice; and (5) repeating the steps (1)-(4) until soil safety reaches the standard. According to the method, the sedumalfredii hance and the broad beans are intercropped and then are subjected to crop rotation with the rice, and various agricultural and strengthening measures are cooperatively conducted, so remediation of cadmium-polluted soil is completed while safe production of crops is guaranteed.

Description

technical field [0001] The invention relates to the technical field of contaminated soil environment treatment, in particular to a method for repairing cadmium-contaminated farmland while producing by using broad bean / sedum sedum intercropping combined with rice rotation. Background technique [0002] my country's farmland is seriously polluted by cadmium, and the area is increasing year by year, and the degree is increasing. It has become one of the severe environmental problems currently facing. Cadmium has strong mobility, high bioconcentration coefficient, easy absorption and long-lasting toxicity. Cadmium in farmland affects plant growth and reduces crop yield and quality. Moreover, cadmium accumulated in the edible parts of crops will eventually enter the human body through the food chain, endangering human health. Therefore, how to control cadmium-contaminated soil, reduce its enrichment in the edible parts of crops, and improve grain yield and quality has aroused w...

Claims

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Application Information

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IPC IPC(8): B09C1/10A01B79/02
CPCA01B79/02B09C1/105B09C2101/00
Inventor 杨肖娥唐琳潘风山林强陆敏陈锋
Owner ZHEJIANG UNIV
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