Method for repairing cadmium-polluted rice field by intercropping sedum alfredii hance and astragalus sinicus

A technology of milk vetch and cadmium pollution, applied in botany equipment and methods, restoration of polluted soil, soil preparation methods, etc., can solve the problems of low plant removal rate, limited repair ability, high Cd content, etc., and has been recognized by farmers High degree, increase biomass, no secondary pollution effect

Pending Publication Date: 2020-05-08
广州草木蕃环境科技有限公司 +1
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  • Claims
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Problems solved by technology

However, the test found that the effect of directly applying Sedum sedum to rice intercropping according to the above method is not satisfactory, the Cd content i

Method used

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  • Method for repairing cadmium-polluted rice field by intercropping sedum alfredii hance and astragalus sinicus
  • Method for repairing cadmium-polluted rice field by intercropping sedum alfredii hance and astragalus sinicus

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Embodiment 1

[0031] The method for repairing cadmium-contaminated rice fields by intercropping Sedum sedum and milk vetch was carried out in a middle-low concentration cadmium-contaminated paddy field in Tangxin Village, Wengyuan County, Shaoguan City.

[0032] The pH value of the polluted soil is 5.4, and the cadmium content is 0.45mg / kg. The test field was originally a paddy field. Late rice was planted in 2018. After the late rice was harvested, the rice straw was cleared and the soil was dried in October 2018. The farmland was plowed today, the land was prepared into furrows, and the drainage system was dredged, and then it started in November 2018. The test specifically includes the following steps:

[0033] (1) Transplant sedum sedum with a seedling age of 25-35 days and a seedling height of 20-25 cm to the test field, and plant milk vetch simultaneously by hole sowing.

[0034] (2) Under the same conditions, it was divided into 3 experimental plots, and the experiments of sedum vet...

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Abstract

The invention discloses a method for repairing a cadmium-polluted rice field by intercropping sedum alfredii hance and astragalus sinicus. The sedum alfredii hance and the astragalus sinicus are planted in an idle rice field in winter, so that effective utilization of land resources and photo-thermal resources is realized, and idle land in the slack winter season and resource waste are avoided while soil of the low-concentration cadmium-polluted rice field is repaired; and the astragalus sinicus can be used as organic green manure; and the sedum alfredii hance and the astragalus sinicus are intercropped, so that cadmium in the soil is effectively removed, and therefore, post-cropping rice absorbs less cadmium.

Description

technical field [0001] The invention relates to the field of remediation of soil polluted by heavy metals, in particular to a method for remediating cadmium-contaminated paddy fields by intercropping sedum sedum and milk vetch. Background technique [0002] With the rapid development of my country's industry and agriculture, a large amount of heavy metals such as cadmium, arsenic, and lead enter the soil environment through mining, sludge agricultural use, sewage irrigation, atmospheric deposition, rainwater erosion, surface runoff, etc., endangering the soil environment ecosystem , there is a pollution risk to the quality and safety of agricultural products, and there is also a greater health risk to human health. The current soil pollution remediation technologies mainly include physical remediation, chemical remediation, phytoremediation, etc. Among them, phytoremediation technology has the advantages of low cost, simple operation, and simultaneous improvement of soil envi...

Claims

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Application Information

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IPC IPC(8): A01B79/02A01G22/00A01G22/40B09C1/00
CPCA01B79/02A01G22/00A01G22/40B09C1/105
Inventor 田美玲李贵杰李智鸣康智明黎华寿王欢俞龙生
Owner 广州草木蕃环境科技有限公司
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