Acid cadmium polluted soil conditioning method for restraining rice cadmium accumulation

Abstract

The invention discloses an acid cadmium polluted soil conditioning method for restraining rice cadmium accumulation. The method comprises the following steps that before ploughing of acid cadmium polluted soil, alkali calcium containing phosphatic fertilizer is evenly broadcasted to the surface of the acid cadmium polluted soil surface, then, base fertilizer is applied, sufficient and uniform stirring is conducted, waterflooding irrigation is conducted in combination with the rice grouting key growth period, the cadmium polluted soil generates a reducing product under the waterflooding irrigation condition, the reducing product is utilized for conducting adsorption on cadmium in the cadmium polluted soil and / or generating chemical deposits, wetting irrigation is conducted in other growth periods, and accordingly the cadmium polluted soil conditioning process is finished. According to the conditioning method, operation is simple and reliable, effect taking is fast after usage, economicbenefits are obvious, and an important significance is achieved for preventing and curing soil heavy metal cadmium pollution and guaranteeing grain safety.

Description

technical field [0001] The invention belongs to the field of agricultural environment, and in particular relates to an acidic cadmium polluted soil conditioning method for suppressing rice cadmium accumulation. Background technique [0002] Cadmium (Cd) is a non-essential element for the human body, and its biological toxicity is extremely strong (Chen Lang, Song Yufang, etc.: "Multi-index comprehensive evaluation of the toxic effects of soil cadmium pollution", "Environmental Science", 2008, 29[9]), in the human body Its half-life is as long as 20 to 40 years, and it can cause "bone pain disease" and kidney damage (Chen Yingxu, "Environmental Science", China Environmental Science Press, 2005), and the 12 global diseases proposed by the United Nations Environment Program It ranks first among the dangerous chemicals of significance. Affected by the growing industries such as mining, smelting, electroplating and printing and dyeing, as well as from agricultural inputs themsel...

AI Technical Summary

Problems solved by technology

However, there are many kinds of existing chemical remediation methods and agronomic control measures, and each method has its own advantages and disadvantages. For example, using sulfite as a soil conditioner to remediate cadmium-contaminated soil has obvious effects, but due to the Certain biological toxicity and risk of carcinogenicity limit its application

However, although the efficiency of remediating cadmium-contaminated soil with composite materials is high, the cost increases due to the complexity of the material composition and preparation process, and the soil environment is easily changed, resulting in increased risks.

Water management is considered to be one of the most effective agronomic measures to control cadmium activity in cadmium-contaminated soils. The long-term flooding model is simple and effective, but it is difficult to implement in places where water resources are scarce, and it is easy to lead to rice yield reduction.

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