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Combined prevention and control method for cadmium exceeding of rice in medium-light cadmium-polluted soil

A technology for cadmium-contaminated soil and cadmium in rice is applied in field preparation methods, botanical equipment and methods, horticulture, etc., which can solve problems such as difficulty in ensuring the quality and safety of rice, and achieve the effects of reducing mobility, protecting the ecological environment, and low cost.

Inactive Publication Date: 2013-04-03
湖南宇丰农科生态工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of existing single soil remediation technology is difficult to guarantee the quality and safety of rice, so it is the future development trend to explore the combination technology mode of effectively controlling soil cadmium pollution

Method used

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  • Combined prevention and control method for cadmium exceeding of rice in medium-light cadmium-polluted soil
  • Combined prevention and control method for cadmium exceeding of rice in medium-light cadmium-polluted soil
  • Combined prevention and control method for cadmium exceeding of rice in medium-light cadmium-polluted soil

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Effect test

Embodiment 1

[0025] A combined prevention and control method for excessive cadmium in rice in medium-slight cadmium-contaminated soil according to the present invention. The object of treatment in this embodiment is acidic cadmium-contaminated soil (tidal mud field), and the properties of the soil are shown in Table 1 below.

[0026] Table 1: Chemical properties of test soil in embodiment 1

[0027]

[0028]The combined prevention and control method of the present embodiment specifically includes the following steps: before plowing and fertilizing the above-mentioned tidal mud field soil, the soil passivating agent slaked lime (Ca(OH) 2 , containing a total amount of cadmium of 0.17mg / kg, and the cadmium content is within the second-level standard value of the national soil quality standard) evenly spread on the surface of moderately cadmium-contaminated soil, and the application rate of slaked lime is 1500kg / hm 2 , then mix well, balance for more than 3 days before applying base fertil...

Embodiment 2

[0037] This embodiment is a demonstration application in the field. Field demonstration applications of more than 1,000 mu were carried out in selected areas, wherein the total cadmium content of the paddy field soil in the first demonstration area was 0.64mg / kg~0.90mg / kg, and the pH value was 5.6~ 5.9, the total cadmium content in paddy field soil in the second demonstration area is 0.52mg / kg-0.77mg / kg, and the pH value is 5.2-5.7.

[0038] The combined prevention and control method of the present embodiment specifically includes the following steps: before the above-mentioned demonstration paddy field soil is plowed and fertilized, the soil passivation agent slaked lime (Ca(OH) 2 , containing a total amount of cadmium of 0.17mg / kg, and the cadmium content is within the second-level standard value of the national soil quality standard) evenly spread on the surface of lightly cadmium-polluted soil, and the application rate of slaked lime is 750kg / hm 2 , then mix well, balance ...

Embodiment 3

[0043] This embodiment is a demonstration application in the field, and a field demonstration application of more than 200 mu has been carried out in a selected area. The total cadmium content of the rice field soil in the demonstration area is 0.97mg / kg-1.21mg / kg, and the pH value is 5.5-5.9.

[0044] The combined prevention and control method of this embodiment specifically includes the following steps: before plowing and fertilizing the soil of the above-mentioned demonstration paddy field, the soil passivator red mud (containing a total amount of cadmium of 0.11mg / kg, and the cadmium content in the national soil quality standard level two within the standard value range) evenly spread on the surface of cadmium-contaminated soil, and the application rate of red mud is 3000kg / hm 2 , and then combined with the application of sodium sulfite 2250kg / hm 2 , fully mix the soil, balance for more than 3 days before applying base fertilizer, transplant low-cadmium-absorbing rice (Xia...

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Abstract

The invention discloses a combined prevention and control method for cadmium exceeding of rice in medium-light cadmium-polluted soil. The method comprises the following steps of: uniformly spreading a soil passivant onto the surface of medium-light cadmium-polluted soil before ploughing and fertilizing the medium-light cadmium-polluted soil; uniformly stirring; balancing for over three days, and applying a basic fertilizer; transplanting low-cadmium-absorption paddy rice onto soil to which the basic fertilizer is applied; and adopting a flooding irrigation management measure at the infertility period of the low-cadmium-absorption paddy rice to complete combined prevention and control of cadmium exceeding of rice. The method disclosed by the invention has the advantages of low cost, environment friendliness, saving in resources, easiness in operating, and the like, the biological effectiveness of cadmium in acid heavy metal-polluted soil can be effectively lowered, and cadmium accumulation of rice is reduced.

Description

technical field [0001] The invention belongs to the technical field of crop food safety control, and in particular relates to a method for preventing and controlling excessive heavy metals in crops by adopting a combination mode. Background technique [0002] Since the 1950s, with the substantial increase in population, the rapid development of mining, metallurgy and manufacturing industries, the extensive use of agricultural chemicals, and the massive discharge of urban sewage and waste, heavy metal pollution has intensified. Environmental problems caused by cadmium (Cd) pollution have attracted much attention. According to the survey, the national cadmium-polluted cultivated land has reached 13,300 hm 2 (See Cui Lituo, Geng Shigang, etc.: "Cadmium Pollution in my country's Farmland Soil and Countermeasures", "Modern Agricultural Science and Technology", 2006, 11S), cadmium (Cd) is extremely toxic (see Colborn T, Vom saal FS, SotoAM: "Developmental effects of endocrine-dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00A01B79/00
Inventor 纪雄辉刘昭兵谢运河彭华
Owner 湖南宇丰农科生态工程有限公司
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