Soil conditioning method capable of reducing cadmium accumulation for paddy rice

A soil conditioning and rice cadmium technology, which is applied in the fields of environmental science, soil science and plant nutrition research, to achieve obvious economic benefits, quick results and simple operation

Inactive Publication Date: 2013-03-20
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, there are many kinds of existing chemical remediation methods and agronomic measures, and each method has its own advantages and disadvantages. How to choose and develop the most optimized, most economical and most effective soil remediation method has always been a technical problem that plagues those skilled in the art.

Method used

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  • Soil conditioning method capable of reducing cadmium accumulation for paddy rice
  • Soil conditioning method capable of reducing cadmium accumulation for paddy rice
  • Soil conditioning method capable of reducing cadmium accumulation for paddy rice

Examples

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Effect test

Embodiment 1

[0022] In this example, a pot test is used to study the effect of the present invention on reducing rice cadmium in acidic cadmium-contaminated soil (flush mud field). The chemical properties of the potted acidic cadmium-contaminated soil of this embodiment are shown in Table 1 below.

[0023] Table 1: Chemical properties of test soil in embodiment 1

[0024]

[0025] First, the soil conditioning method of the present invention is used to condition the acidic cadmium-contaminated soil of the present embodiment, including the following steps: the test uses a ceramic pot, and the acidic cadmium-contaminated soil before potting is air-dried and sieved (aperture is 0.5cm×0.5cm) Mix evenly, then before acidic heavy metal cadmium polluted soil is fertilized, acidic cadmium polluted soil is packed in the pot, every pot is filled with soil 5.0kg, then soil conditioner sodium sulfite is evenly sprinkled on the surface of acidic heavy metal cadmium polluted soil, At the same time, a...

Embodiment 2

[0039] In this example, a field plot test is used to study the effect of the present invention on reducing rice cadmium in acidic cadmium-contaminated soil (red-yellow mud). The chemical properties of the acidic cadmium-contaminated soil of the present embodiment are shown in Table 2 below.

[0040] Table 2: Chemical properties of test soil in embodiment 2

[0041]

[0042] At first, the acidic cadmium-contaminated soil of the present embodiment is conditioned by the soil conditioning method of the present invention, which includes the following steps: before plowing and fertilizing the acidic heavy metal cadmium-contaminated soil in the field, evenly spreading the soil conditioning agent sulfite on the acidic cadmium-contaminated soil Heavy metal cadmium pollutes the surface of the soil, then apply nitrogen, phosphorus, and potassium fertilizers, and mix well; then cooperate with soil flooding conditioning measures to keep the soil in a state of flooding for a long time, a...

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Abstract

The invention discloses a soil conditioning method capable of reducing cadmium accumulation for paddy rice. The soil conditioning method comprises the following steps of: before ploughing and fertilizing acid soil contaminated by heavy metal cadmium, uniformly spreading a soil conditioner sulfite over the surface of the acid soil contaminated by the heavy metal cadmium, then applying a base fertilizer, and blending sufficiently; and with combination of soil flooding conditioning, making the soil in a flooded state in a rice growth period so as to make the acid soil contaminated by the heavy metal cadmium in a low-electrochemical-potential reducing environment with Eh being (-150mV)-(-300mV), effectively adsorbing the cadmium in the soil by using the generated reduzate, and generating chemical precipitates, thereby completing the soil conditioning process. The soil conditioning method disclosed by the invention is simple and reliable in operation, quick in response after utilization and obvious in economic benefits, and has great significance of controlling the heavy metal cadmium contamination of the soil and guaranteeing the food safety.

Description

technical field [0001] The invention belongs to the research fields of environmental science, soil science and plant nutrition, and in particular relates to a repair method for heavy metal polluted soil. Background technique [0002] The heavy metal cadmium (Cd) is one of the highly toxic environmental pollution elements (Chen Lang, Song Yufang, etc.: "Multi-index comprehensive evaluation of the toxic effects of soil cadmium pollution", "Environmental Science", 2008, 29[9]), in It ranks first among the 12 dangerous chemicals of global significance proposed by the United Nations Environment Programme. Cadmium is extremely harmful to the human body and can cause "bone pain disease" and kidney damage (Chen Yingxu, "Environmental Science", China Environmental Science Press, 2005). Cadmium is an associated ore of various minerals. Affected by the growing mining, smelting, electroplating, printing and dyeing industries, as well as agricultural inputs, cadmium pollution in farmlan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 刘昭兵纪雄辉谢运河彭华
Owner 湖南宇丰农科生态工程有限公司
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