Method for repairing cadmium polluted soil through crop rotation of two crops

Abstract

The invention discloses a method for repairing cadmium polluted soil through crop rotation of two crops. Sticktight is planted in the cadmium polluted soil at the beginning of June in the year, and the sticktight is harvested at the end of September; oilseed rape is planted in the soil in which the sticktight is harvested at the beginning of October in the year, and the oilseed rape is harvested at the end of May in the next year; the sticktight continues to be planted in the soil in which the oilseed rape is harvested at the beginning of June in the next year, the two crops are circularly planted, and the sticktight and oilseed rape crop rotation planting system is formed. Through crop rotation planting of the sticktight and the oilseed rape, the cadmium polluted soil can be continuously repaired, the overground parts of the sticktight and the oilseed rape are used for absorbing cadmium in the soil, the harvested oilseed rape can also be used for extracting edible colza oil, and a certain economic income is brought to peasants. Compared with the existing situation that peanuts or sunflowers serve as repairing plants, the removal capability of cadmium in the soil is high, the risk that the heavy metal absorbed in the plant enters the food chain does not exist, and the method is very suitable for repairing of cadmium polluted soil in the northern area.

Description

technical field [0001] The invention relates to soil remediation technology, in particular to a method for remediating cadmium-contaminated soil by utilizing two crop rotations. Background technique [0002] Cadmium is a common polluting heavy metal in soil and one of the most important polluting heavy metals in soil in my country. The main sources of cadmium in polluted soil include non-ferrous metal mining and smelting. In uncontaminated soil, the cadmium content is generally around 0.1 mg / kg, while the cadmium content in the soil near non-ferrous metal smelting enterprises can reach tens or even hundreds of times that of uncontaminated soil. [0003] Cadmium is not an essential nutrient element for the human body. If cadmium enters the human body through breathing, diet, etc., it will have adverse effects on the human body. For example, cadmium will stimulate the respiratory tract. Long-term exposure to a cadmium-contaminated environment will cause anosmia, gingival mac...

AI Technical Summary

Problems solved by technology

Although peanuts and sunflowers can be used as oil crops to produce edible oil, they can also be eaten directly. When peanuts and sunflower seeds are eaten directly, the high cadmium content in them will have a great risk