A kind of cadmium polluted paddy field control and the production method of reducing cadmium in rice

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...

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