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Method for repairing cadmium-polluted rice field by intercropping sedum alfredii and broad beans

A technology of cadmium pollution and broad bean, which is applied in the direction of botanical equipment and methods, restoration of contaminated soil, land preparation methods, etc., can solve the problems of low plant removal rate, limited repair ability, unsatisfactory effect, etc., without destroying the soil Physicochemical properties, increased biomass, high farmers' acceptance effect

Pending Publication Date: 2020-05-08
SOUTH CHINA AGRI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 in rice is still high, which does not meet the national standard requirements, and the plant removal rate of Cd is not high, and the repair ability is very limited

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  • Method for repairing cadmium-polluted rice field by intercropping sedum alfredii and broad beans
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  • Method for repairing cadmium-polluted rice field by intercropping sedum alfredii and broad beans

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for repairing cadmium-contaminated rice fields by intercropping Sedum sedum and broad bean was carried out in a middle-low concentration cadmium-contaminated paddy field in Tangxin Village, Wengyuan County, Shaoguan City.

[0031] 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:

[0032] (1) Transplant Sedum sedum with a seedling age of 25 to 35 days and a seedling height of 15 to 20 cm to the experimental field, and plant broad beans synchronously by hole sowing, 3 seeds per hole, and 1 seedling.

[0033] (2) Under the same conditions, it was divided into 3 expe...

Embodiment 2

[0054] The method for repairing cadmium-contaminated rice fields by intercropping Sedum sedum and broad bean was carried out in a middle-low concentration cadmium-contaminated paddy field in Tangxin Village, Wengyuan County, Shaoguan City.

[0055] The cadmium content of the polluted soil was 0.55 mg / kg. The test field was originally a paddy field. After the late rice was harvested, the farmland was plowed today, the land was prepared into furrows, the drainage system was dredged, and then the test was carried out, which specifically included the following steps:

[0056] 1. Specific repair method

[0057] (1) The seedling age is 25-35 days, and the seedling height is 15-20cm Sedum sedum is transplanted to the test field, adopts hole sowing method to plant broad beans synchronously, every hole sows 3 grains, and 1 seedling is established;

[0058] (2) Under the same conditions, it was divided into 3 experimental plots, and the experiment of broad bean monoculture, southeast s...

Embodiment 3

[0067] The method for repairing cadmium-contaminated rice fields by intercropping Sedum sedum and broad bean was carried out in a middle-low concentration cadmium-contaminated paddy field in Tangxin Village, Wengyuan County, Shaoguan City.

[0068] The cadmium content of the polluted soil was 0.75 mg / kg. The test field was originally a paddy field. After the late rice was harvested, the farmland was plowed today, the land was prepared into furrows, the drainage system was dredged, and then the test was carried out, which specifically included the following steps:

[0069] 1. Specific repair method

[0070] (1) Transplant Sedum sedum with a seedling age of 25 to 35 days and a seedling height of 15 to 20 cm to the experimental field, and plant broad beans synchronously by hole sowing, 3 seeds per hole, and 1 seedling.

[0071] (2) Under the same conditions, it was divided into 3 experimental plots, and the experiment of broad bean monoculture, southeast sedum monoculture and so...

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Abstract

The invention discloses a method for repairing a cadmium-polluted rice field by intercropping sedum alfredii and broad beans. The sedum alfredii and the broad beans are planted on an idle rice field in winter, so that effective utilization of land resources and photo-thermal resources is realized, and the winter-fallowed land and wasting of resources are avoided while soil of the rice field polluted by low-concentration cadmium is repaired; the cadmium content of fruits meets the national food safety limit standard under the condition that the yield of the broad beans is slightly reduced; themethod has important significance for ensuring the food safety of China and the health of people; and the cadmium is passivated to a certain extent, so that the cadmium is absorbed less by rice whichis used as a later crop.

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 broad bean. 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): A01B79/02A01G22/40A01G22/00B09C1/00
CPCA01B79/02A01G22/40A01G22/00B09C1/105
Inventor 康智明黎华寿叶少媚田美玲李贵杰李智鸣吴海欣郑煜泽
Owner SOUTH CHINA AGRI UNIV
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