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Rice cultivation water management method for moderate and mild arsenic pollution paddy field

A management method and technology for arsenic pollution, which is applied in the field of arsenic pollution treatment in rice fields, can solve the problems of increased bioavailability of arsenic, polluted rice fields, increased absorption and accumulation of arsenic by rice plants, etc., and achieves the effect of reducing toxicity and absorption and accumulation

Inactive Publication Date: 2014-01-01
曾敏 +1
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Problems solved by technology

[0004] At present, rice planting generally adopts flood irrigation (F: Flooded) throughout the growth period. However, this method is very inappropriate for arsenic-contaminated paddy fields. It can increase the bioavailability of arsenic in the soil, thereby increasing the absorption and accumulation of arsenic by rice plants.

Method used

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  • Rice cultivation water management method for moderate and mild arsenic pollution paddy field
  • Rice cultivation water management method for moderate and mild arsenic pollution paddy field
  • Rice cultivation water management method for moderate and mild arsenic pollution paddy field

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Embodiment

[0021] In late March (early rice), early May (middle rice), and late June (late rice), weeding, soil preparation, and deep plowing were carried out on rice fields with moderate to mild arsenic pollution. For lightly arsenic-polluted paddy fields (the total arsenic content in the soil exceeds 0-2 times the national soil environmental quality standard), deep plowing should be 25-30 cm; 2-5 times) deep plowing with 30-35 cm is advisable. After deep plowing, carry out fine soil preparation to keep the soil moisture content at 40%-60%, and at the same time ensure that the water supply and drainage functions of the paddy field are good.

[0022] In paddy fields with moderate to mild arsenic pollution, rice plants are normally planted, and flood irrigation is used before the tillering stage of rice growth, and the height of the water layer above the surface soil is kept at 5-8 cm. -Wet alternate irrigation (AFA). The specific operation method is as follows:

[0023] (1) During the...

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Abstract

The invention belongs to the technical field of paddy field arsenic pollution treatment, and particularly discloses a rice cultivation water management method for a moderate and mild arsenic pollution paddy field. The water content of the arsenic pollution paddy field is reasonably adjusted by alternately performing waterflooding-moistening irrigation in the whole growth period of rice, the arsenic content of soil solution is remarkably reduced, and trivalent arsenic in soil can be transformed into low-toxicity pentavalent arsenic. By changing the form and the valent state of the arsenic in the soil, arsenic absorption and accumulation of the rice are reduced, so that the arsenic content of the rice is reduced. Measurement proves that the arsenic content of the rice cultivated by the method meets the pollutant limit standard (inorganic arsenic<0.2mg / kg, GB2726-2012) of national food.

Description

technical field [0001] The invention belongs to the technical field of arsenic pollution treatment in paddy fields, and specifically discloses a method for managing rice planting water in paddy fields with medium and light arsenic pollution. Background technique [0002] Arsenic is identified as a "known human carcinogen" by the World Health Organization (WHO) and the US Environmental Protection Agency (USEPA). Long-term exposure of the human body to an environment rich in arsenic can cause skin cancer and damage to internal organs such as kidneys, liver, and bladder. cancerous. In recent years, endemic arsenic poisoning caused by arsenic pollution has occurred frequently around the world (especially in Southeast Asia), seriously threatening the health of local residents. In Chenzhou, Hunan, soil arsenic pollution caused by mineral resource mining and smelting processing has become the three "characteristic" pollution in this area. In the vast majority of mining areas in C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G16/00A01G22/22
Inventor 曾敏廖柏寒龙水波周航
Owner 曾敏
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