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Production method for cadmium-polluted rice land governing and rice cadmium reduction

A production method and a cadmium pollution technology are applied in the fields of cadmium-contaminated paddy field treatment and rice cadmium reduction, which can solve the problems of changing the basic physical and chemical properties of soil, side effects of soil ecosystem, ecological environment risks, etc. Adsorption capacity, low cost effect

Active Publication Date: 2015-08-05
HUNAN SOIL & FERTILIZER INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the past, the research on soil heavy metal treatment mostly focused on the physical and chemical methods of heavy metal adsorption and fixation, such as electrochemistry, leaching, guest soil, and synthetic chelating agents. Although the content of heavy metals in soil has been reduced to a certain extent, there are Problems with high input costs or major safety hazards, such as artificially synthesized chelating agents EDTA, DTPA, and citric acid, are not only expensive, but improper input may also lead to groundwater pollution or side effects on the soil ecosystem
The use of passivators is also a common way to remediate and utilize cadmium-contaminated soil, but the extensive application of passivators not only changes the basic physical and chemical properties of the soil, but also may have an impact on soil microbial populations and ecological environment, thus bringing certain ecological damage. environmental risk

Method used

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Examples

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Effect test

Embodiment 1

[0038] From 2013 to 2014, in Fulin Town, Changsha County, 10 mu of cadmium-contaminated double-cropping paddy fields and 5 mounds were selected, half of which were using this technology, and the other half were using conventional management models as a control. The specific farming operations are as follows:

[0039]On October 12, 2013, the late rice was harvested with 50 cm stubble left, and the harvested part was removed to prepare biochar, which was returned to the field one day before the early rice seedlings were transplanted; on October 15, milk vetch was sown, and the seed dosage of milk vetch was 2kg / mu , the control area is winter slack. In the experimental area, 10 days before early rice transplanting in 2013, the milk vetch field was dry plowed and pressed, and lime was applied at a rate of 50kg / mu before turning. On April 25, 2014, the early rice was transplanted. The early rice variety was Zhongjiazao 17. The nitrogen, phosphorus and potassium fertilizers in the ...

Embodiment 2

[0042] From 2013 to 2014, Wangxian Town, Liling City selected 10 mu of cadmium-contaminated double-cropping paddy fields and 5 mounds, half of which used this technology for each mound, and the other half used conventional management models as a control. The specific farming operations are as follows:

[0043] On October 17, 2013, the late rice was harvested with 30cm of stubble left, and all of them were removed to prepare biochar and returned to the field one day before the early rice seedlings were transplanted; on October 19, milk vetch was sown, and the seed dosage of milk vetch was 1.5kg / mu , the control area is winter slack. In the experimental area, 15 days before the transplanting of early rice in 2014, the milk vetch field was dry plowed and turned over, and lime was applied at a rate of 70kg / mu before turning over. On April 27, 2013, the early rice was transplanted. The early rice variety was Zhongjiazao 17. The nitrogen, phosphorus and potassium fertilizers in the...

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Abstract

The invention discloses a production method for cadmium-polluted rice land governing and rice cadmium reduction. The production method comprises the following steps: a, preparing biomass charcoal by late rice straw to return to field and prepare milk vetch green manure in winter; b, overturning and pressing milk vetch green manure along with spraying lime; c, regulating and controlling water fertilizer of early season rice; d, preparing biomass charcoal by straw in early season to return to field; e, regulating and controlling water fertilizer of late rice. The production method improves soil fertility, reduces the effectiveness of cadmium polluted soil, combines the water fertilizer regulation and management, and effectively stops and controls the cadmium transfer towards the rice planting body, in particular to rice; the production method provides a low-price and practicable environmental protection regulating technology for the green repair of soil heavy metal cadmium pollution and rice cadmium reduction on the polluted rice land, and provides technical support to the polluted rice field governing and rice cadmium reduction in the southern China.

Description

technical field [0001] The invention relates to a production method for treating cadmium-polluted paddy fields and reducing cadmium in rice. Background technique [0002] Cadmium (Cd) is regarded as the most harmful polluting element among heavy metals due to its high mobility in soil and high toxicity to crops. According to the survey results of the State Environmental Protection Administration, the area of ​​cadmium-contaminated farmland in my country has exceeded 280,000 hectares, and the annual cadmium-exceeding agricultural products reach 1.5 million tons. Soil cadmium pollution has become one of the most important environmental problems in my country, seriously threatening the quality and safety of agricultural products and agricultural production. The stability of the regional ecosystem. Especially in southern rice-growing areas, the problem of excessive heavy metals in rice has become very prominent. The incident of excessive cadmium in rice caused by cadmium polluti...

Claims

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Application Information

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IPC IPC(8): A01G16/00A01G1/00A01G22/22
CPCA01G22/00A01G22/22
Inventor 聂军廖育林鲁艳红谢坚杨曾平曹卫东周兴吴浩杰孙玉桃
Owner HUNAN SOIL & FERTILIZER INST
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