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

A technology for cadmium-contaminated soil and crops, which is applied in the field of soil remediation to achieve the effects of increasing land income, reducing cadmium content and having strong removal ability.

Inactive Publication Date: 2017-09-19
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

Although peanuts and sunflowers can be used as oil crops to produce edible oil, they can also be eaten directl

Method used

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Embodiment Construction

[0018] The crop rotation planting method of the present invention will be discussed in more detail below through specific embodiments.

[0019] A cadmium-contaminated soil area formed by lead smelting in the suburbs of Jiyuan City, Henan Province was selected as the project area. The land area of ​​the project area is 400 m 2 (10 m wide, 40 m long). The test started in June 2015, and the measurement showed that the average content of total cadmium in the 0-20 cm soil in the project area was 2.60 mg / kg.

[0020] 1. Divide the project into 4 districts, the length and width of each district are 10 m, that is, the area of ​​each district is 100 m 2 .

[0021] 2. On June 3, 2015, the ghost needle grass was planted. In each plot, trenches were opened at intervals of 20 cm, and the depth of the trench was about 5 cm. Water was properly irrigated in the trench according to the moisture content. Afterwards, the seeds of Elephant Needle were evenly scattered into the trench, covered...

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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...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/105B09C2101/00
Inventor 邢维芹李立平赵强曹恩泽刘辉郑亚丽
Owner HENAN UNIVERSITY OF TECHNOLOGY
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