Method for reducing cadmium content of vegetables planted in cadmium contaminated soil

Abstract

The invention discloses a method for reducing the cadmium content of vegetables planted in cadmium contaminated soil. The method includes the following steps that a layer of matrix is laid on the surface of the cadmium contaminated soil to plant the vegetables, and the water-holding capacity of the soil is kept at 60-70%; bacterium liquid of azospirillum brasilense with the conservation number of CGMCC 1.10379 is sprayed on the rhizosphere soil of the vegetables. Harm to crops by soil Cd can be effectively relieved, the vegetable yield is increased, the Cd content of the crops is reduced, and the cadmium is controlled and prevented from entering a food chain along with the crops to harm human health.

Description

technical field [0001] The invention relates to the technical field of heavy metal-contaminated soil treatment, in particular to a method for reducing cadmium content in vegetables planted in cadmium-contaminated soil by using Azospirillum brasiliensis. Background technique [0002] Since the discovery of Cd in the early 20th century, Cd has been widely used in electroplating industry, chemical industry, electronics industry and nuclear industry and other fields, and a considerable amount of Cd is discharged into the environment through waste gas, waste water and waste residue. In 2014, the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the rate of Cd pollutant points in my country's cultivated land exceeded the standard by 7.0%. The soil in the suburbs of most cities in my country has been polluted by Cd to a certain extent, and these Cd-contaminated soils are often used...

AI Technical Summary

Problems solved by technology

Although this method can reduce the Cd pollution on the soil surface and the Cd content in the vegetable body, the amount of engineering is large, the investment cost is high, the soil structure is destroyed, and the soil fertility is reduced.

2. Chemical remediation, put amendments (such as lime, zeolite, calcium carbonate) into the soil to reduce the bioavailability of Cd through the adsorption, redox, antagonism or precipitation of Cd, but it only changes the Cd in the soil In the existing form, Cd remains in the soil and is easily reactivated to harm plants

Although this method has no secondary pollution, it is slow to take effect and has a long cycle