Method for inhibiting rice from absorbing arsenic and cadmium by using gypsum composite

A compound and gypsum technology, applied in the field of soil remediation, can solve the problems of high cost of physical remediation methods, inapplicability of large-area polluted soil, and affecting large-area rice planting, etc., to achieve stable effect, easy access, and good growth

Inactive Publication Date: 2019-01-25
RES INST OF ZHEJIANG UNIV TAIZHOU +1
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the cost of physical remediation is high, and it is not suitable for the remediation of large-scale contaminated soil, and the more

Method used

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  • Method for inhibiting rice from absorbing arsenic and cadmium by using gypsum composite
  • Method for inhibiting rice from absorbing arsenic and cadmium by using gypsum composite
  • Method for inhibiting rice from absorbing arsenic and cadmium by using gypsum composite

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[0026] Example

[0027] The method for inhibiting the absorption of arsenic and cadmium by rice by using gypsum compound of the present invention includes the following steps:

[0028] 1) The first season of rice: First, add 0.15% gypsum compound (G1F1) and 0.30% of gypsum compound (G1F1) to paddy soil contaminated by arsenic and cadmium (soil arsenic content is 68.02mg / kg, cadmium content is 0.43mg / kg). Gypsum compound (G2F2), after mixing it with the paddy soil thoroughly, add the same amount of deionized water to the soil to be flooded about 3cm in each treatment. After stabilizing for 48 hours, transplant rice seedlings Xiushui 03 (a variety with low arsenic and cadmium accumulation) ), the water is always about 3cm before rice filling, no base fertilizer is added before rice planting, urea 0.16g / kg, potassium dihydrogen phosphate 0.08g / kg, booting fertilizer 0.12g / kg, diphosphate Potassium hydrogen 0.06g / kg. At the same time, the treatment without gypsum compound was set as ...

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Abstract

The invention discloses a method for inhibiting rice from absorbing arsenic and cadmium by utilizing a gypsum composite, which comprises the following steps of: before rice is transplanted, the gypsumcomposite is applied to paddy field soil polluted by the arsenic and the cadmium, and the gypsum composite and the paddy field soil are fully and uniformly mixed; before rice filling, the flooding depth of paddy soil is kept at 2-4 centimeters; after the rice is filled, the surface layer of the paddy field soil is kept moist, and no flooded water layer exists. The gypsum composite has stable effect of inhibiting the rice from absorbing arsenic and cadmium, is easy to obtain, is economical and practical, and can continuously act on the rice for at least two growth seasons.

Description

technical field [0001] The invention relates to a method for inhibiting rice from absorbing arsenic and cadmium by using a gypsum compound, and belongs to the technical field of soil restoration. Background technique [0002] In recent years, with the acceleration of industrialization and urbanization, the extensive use of arsenic and cadmium-containing chemicals and the discharge of arsenic and cadmium-containing wastewater from metallurgical and chemical industries have led to a large amount of arsenic and cadmium accumulation in the soil. Typical heavy metal pollutants. For example, the discharge of wastewater from an arsenic product factory in Hunan has caused serious arsenic pollution in farmland soil. The soil arsenic content in heavily polluted areas is 7.7-255mg / kg, with an average value of 97.1mg / kg, which is much higher than the limit value of arsenic in farmland soil; Lechang, Guangdong Province The surrounding area of ​​the lead-zinc mine was irrigated with mini...

Claims

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Application Information

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IPC IPC(8): A01G22/22A01G7/06C05G1/00
CPCA01G7/06A01G22/22C05D3/02C05D9/02
Inventor 赵文亮邱伟迪翟伟伟陈敏唐先进
Owner RES INST OF ZHEJIANG UNIV TAIZHOU
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