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Method for reducing accumulation quantity of arsenic in crops

A crop and accumulation technology, which is applied in the field of reducing the accumulation of arsenic in crops, can solve the problems of long-term, complete or partial suspension of agricultural production activities, insignificant application effect of a single method, and a large amount of physical repair technology. Reduced migration ability, low price, environmentally friendly effect

Inactive Publication Date: 2017-07-07
中环循环境技术有限责任公司
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Problems solved by technology

Among the remediation technologies for soil arsenic pollution, the physical remediation technology has a large amount of engineering and high cost, and is not suitable for the treatment and restoration of large-scale farmland; biological remediation takes a long time and needs to completely or partially stop agricultural production activities, and the acceptance of current farmers needs to be improved; Restoration changes the form and mobility of heavy metals by adding heavy metal activators or passivators. It has the characteristics of high efficiency and strong operability, but it often needs to add a large amount of substances to play a role, and some substances have a greater impact on soil physical and chemical properties. It is not conducive to the normal production and utilization of subsequent farmland; agroecological measures such as adjusting crop varieties and field management have certain application value in reducing the accumulation of heavy metals in crops, but the effect of a single method is not significant

Method used

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  • Method for reducing accumulation quantity of arsenic in crops

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Embodiment 1

[0022] The experimental soil was collected from Chaoyang District, Beijing, and passed through a 10-mesh sieve. The arsenic-contaminated soil was artificially added with Na 2 HASO 4 ·7H 2 O is configured. In this example, the artificially prepared soil arsenic concentration is 90.2 mg / kg. A pot experiment was adopted, each plastic pot was filled with about 2 kg of soil, Chinese cabbage was selected as the test crop, and 4 seedlings were kept in each pot. A blank control group was set for the experiment, and 6 replicates were set for each treatment group. Add kaolinite at 10g / kg and iron powder at 6g / kg to each pot of soil, mix the soil conditioner with the soil, and age for 7 days, according to N:P:K=0.3:0.1:0.2mg / kg Add base fertilizer to the amount of soil, sow pak choy seeds, and keep the soil moisture content at 30-40%. After the pak choy grows normally, spray foliar fertilizer with 0.15% potassium dihydrogen phosphate. It is advisable to completely moisten the leaves e...

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Abstract

The invention provides a method for reducing accumulation quantity of arsenic in crops and belongs to the fields of heavy metal pollution remediation and agricultural product safety. According to the technical scheme adopted by the invention, deep ploughing is performed on soil before crops are planted, soil moisture content is reasonably controlled, and an appropriate amount of clay minerals and an arsenic precipitate adsorbent are added into arsenic-polluted surface soil to improve soil; surface soil and an improver are turned over and are uniformly mixed, and are aged for 20 days; and a base fertilizer is added and crops are planted, and a leaf phosphorus fertilizer is sprayed after crops normally grow to reduce arsenic accumulation of the crops and increase the crop yield. The method is strong in operability, is environmentally friendly, and can realize continuous and safe planting of crops on medium-light arsenic polluted soil.

Description

technical field [0001] The invention belongs to the fields of restoration of soil heavy metal pollution and safety of agricultural products, and in particular relates to a method for reducing the accumulation of arsenic in crops. Background technique [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources, the rate of excessive soil points in cultivated land in the country accounts for 19.4%, and heavy metal inorganic pollutants are the main pollutants, such as cadmium, mercury, arsenic, copper, lead, and chromium. Among the 8 kinds of heavy metals including cadmium, zinc and nickel, the excessive rate of arsenic pollution is second only to cadmium and nickel. Mainly, heavy pollution accounts for a minority. [0003] The form of arsenic in soil affects its bioavailability and toxicity. Arsenic exists mainly as inorganic As(III) and As(V) in soil, and the mobility and toxic...

Claims

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Application Information

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IPC IPC(8): B09C1/08A01C21/00
CPCA01C21/00B09C1/08
Inventor 龚宇阳李东明龚永欢穆成华
Owner 中环循环境技术有限责任公司
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