Soil management method for safe production of rice in rice field seriously polluted by Cd and application of method

A soil management and safe production technology, applied in the field of polluted farmland treatment, can solve the problems of price drop, heavy metal Cd pollution, aggravation, etc., to achieve the effect of ensuring production and reducing Cd content

Inactive Publication Date: 2019-09-17
SICHUAN AGRI UNIV
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Problems solved by technology

Years of testing results show that the heavy metal Cd pollution situation in agricultural product production areas is severe and is on the rise, resulting in uns

Method used

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  • Soil management method for safe production of rice in rice field seriously polluted by Cd and application of method
  • Soil management method for safe production of rice in rice field seriously polluted by Cd and application of method
  • Soil management method for safe production of rice in rice field seriously polluted by Cd and application of method

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Embodiment 1

[0029] A soil management method for the safe production of rice in paddy fields heavily polluted by Cd, which comprises the following steps:

[0030] Soil passivation treatment:

[0031] Take the 0-20cm polluted farmland soil of the land to be managed, and determine the pollution characteristics of heavy metal Cd in the farmland soil according to the soil pH value, total Cd and effective Cd content, and divide according to the pollution level of "Soil Environmental Quality Standard" (GB 15618-1995) If the soil total Cd exceeds 1.0mg·kg -1 as "severe" pollution;

[0032] According to soil pH, determine the application amount of passivation material in polluted farmland: in acidic soil, the preferred passivation material is jade powder, and the dosage is 2.25kg m -2 (about 1.0% of soil weight); neutral soil, the preferred passivation material is jade powder or fly ash, the dosage is 2.25kg m -2 (about 1.0% of soil weight).

[0033] Specifically, the jade powder was purchased...

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Abstract

The invention discloses a soil management method for safe production of rice in a rice field seriously polluted by Cd and application of the method, and relates to the technical field of polluted farmland treatment. The soil management method comprises the steps of soil passivation treatment before rice transplantation and water management at a corresponding growth period after rice transplantation, and the rice can be reasonably planted in the rice field seriously polluted by Cd; meanwhile, the content of soil-available Cd is obviously reduced, the absorption of Cd in the growth process of the rice is inhibited, and rice grains which meet the requirements of national food safety are harvested while the yield of the rice is guaranteed.

Description

technical field [0001] The invention relates to the technical field of polluted farmland treatment, in particular to a soil management method and application thereof for safe rice production in paddy fields heavily polluted by Cd. Background technique [0002] With the rapid advancement of China's industrialization and urbanization process, heavy metal pollution in soil has become increasingly prominent, and agricultural product safety incidents such as "cadmium rice incident", "children's blood lead exceeding standard" and "urine cadmium exceeding standard" caused by farmland soil pollution in some areas have caused serious problems. strong response from society. Among all heavy metal pollutants, cadmium (Cd) is listed as the "top five poisons" due to its high mobility, high toxicity and wide pollution area. According to the "2014 National Soil Pollution Survey Bulletin", the rate of Cd exceeding the standard in cultivated land soil in my country reached 7.0%, ranking firs...

Claims

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Application Information

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IPC IPC(8): A01G22/22A01B79/00
CPCA01B79/00A01G22/22
Inventor 余海英唐婵李廷轩张锡洲黄化刚郑子成王永东张路
Owner SICHUAN AGRI UNIV
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