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Method for reducing cadmium pollution to soil by planting edible amaranth

A technology of cadmium pollution and heavy metals, applied in the field of bioremediation of contaminated soil, can solve problems such as reducing international competitiveness, secondary pollution, and affecting agricultural product exports

Inactive Publication Date: 2017-09-22
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second is to affect food safety and threaten human health
The third is to affect the export of agricultural products and reduce international competitiveness
Physical methods are slow to take effect, while chemical methods are fast but easily cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for reducing soil heavy metal cadmium pollution by planting amaranth according to the present invention is characterized in that: it comprises the following technical steps: plant repair plants in cadmium-contaminated soil, and the water holding capacity of the soil is 60% of the field water holding capacity in the repair cycle Watering the cadmium-contaminated soil with a 1:1 weight mixture of probiotics and straw humification solution, after the repair cycle is over, removing the repaired plant as a whole from the cadmium-contaminated soil; the repaired plant is amaranth; The beneficial bacteria agents are Bacillus subtilis, Bacillus thermophiles, and Bacillus colioids, and the immobilized carrier is 20% soybean meal, 15% tartary buckwheat husk, 40% corn silk, 2% corn stalk, 0.05% NH 4 NO 3 , 0.03% MgSO 4 ·7H 2 O; straw humification solution is after wheat and corn stalks are harvested, the stalks are crushed into 20cm long stalk sections; 20% of the straw ...

Embodiment 2

[0020] A method for reducing soil heavy metal cadmium pollution by planting amaranth according to the present invention is characterized in that: comprising the following technical steps: planting restoration plants in cadmium-contaminated soil, and according to the soil water holding capacity being 65% of the field water holding capacity in the restoration cycle Watering the cadmium-contaminated soil with a 1:1 weight mixture of probiotics and straw humification solution, after the repair cycle is over, removing the repaired plant as a whole from the cadmium-contaminated soil; the repaired plant is amaranth; The beneficial bacteria agents are Bacillus subtilis, P. thermophiles and Bacillus colioids, and the immobilized carrier is 25% soybean meal, 20% tartary buckwheat husk, 45% corn silk, 3% corn stalk, 0.2% NH 4 NO 3 , 0.05% MgSO 4 ·7H 2 O; straw humification solution is after wheat and corn stalks are harvested, the stalks are crushed into 20cm long stalk sections; 20% o...

Embodiment 3

[0022] A method for reducing soil heavy metal cadmium pollution by planting amaranth according to the present invention is characterized in that: it comprises the following technical steps: plant repair plants in cadmium-contaminated soil, and the water holding capacity of the soil is 70% of the field water holding capacity in the repair cycle Watering the cadmium-contaminated soil with a 1:1 weight mixture of probiotics and straw humification solution, after the repair cycle is over, removing the repaired plant as a whole from the cadmium-contaminated soil; the repaired plant is amaranth; The beneficial bacteria agents are Bacillus subtilis, P. thermophiles, and Bacillus colioids. The immobilized carrier is 22% soybean meal, 18% tartary buckwheat husk, 45% corn silk, 3% corn stalk, 0.2% NH 4 NO 3 , 0.05% MgSO 4 ·7H 2 O; straw humification solution is after wheat and corn stalks are harvested, the stalks are crushed into 20cm long stalk sections; 20% of the straw quality is ...

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Abstract

The invention discloses a method for reducing cadmium pollution to soil by planting edible amaranth. Remediation plants are planted in cadmium-polluted soil, a mixture of a beneficial bacterium agent and a humified straw solution is poured into the cadmium-polluted soil according to the ratio that water-holding capacity of the soil accounts for 60%-70% of the field capacity in a remediation period, wherein the weight ratio of the beneficial bacterium agent to the humified straw solution is 1 to 1, and the whole remediation plants are moved away from the cadmium-polluted soil at the end of the remediation period. On the premise that the edible amaranth is used as a biomass material, when the edible amaranth is used for remediating the cadmium-polluted soil, the activation induction effect of the beneficial bacterium agent and the humified straw solution is achieved, so that the biological effectiveness of cadmium is improved, the absorption and enrichment of the plants to the cadmium are promoted, and the phytoremediation rate of the soil polluted by the cadmium is increased; and in addition, the beneficial bacteria agent and the humified straw solution can promote the mass addition of the overground parts, the stem leaves and the dry matter of the root system of the edible amaranth, so that long-term goals of restoring land productivity and promoting regional landscape harmony, ecological balance and sustainable development are ultimately achieved.

Description

technical field [0001] The invention relates to bioremediation technology of polluted soil, in particular to a method for reducing soil heavy metal cadmium pollution by planting amaranth. Background technique [0002] At present, there are about 150 million mu of arable land polluted by heavy metals, chemical fertilizers, and pesticides, accounting for more than 1 / 10 of the total arable land. Data from the 2009 China Food Safety Forum report showed that one-sixth of my country's arable land was polluted by heavy metals, and the area of ​​contaminated soil was at least 20 million hectares. [0003] Soil heavy metal pollution has brought serious consequences: First, it affects the quality of cultivated land and causes direct economic losses. It is estimated that 12 million tons of grains are polluted by heavy metals nationwide every year, causing direct economic losses of more than 20 billion yuan. The second is to affect food safety and threaten human health. Heavy metals ...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 苏品廖晓兰马文月张亚黄璜廖石榴曹海佳黄尧
Owner HUNAN AGRICULTURAL UNIV
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