Method for lowering harmful heavy metal concentration of crops

A technology for crops and heavy metals, applied in the field of farmland soil pollution remediation, can solve the problems of soil fertility reduction, etc., and achieve the effect of simple operation, broad application prospects, and obvious soil passivation effect

Active Publication Date: 2018-01-05
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used passivation methods have their own advantages and disadvantages.
At the same time, the process of passivator application often passivates soil nutrients at the same time, resulting in a decrease in soil fertility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) The soil is selected from the alkaline cadmium-contaminated greenhouse soil in the northern dry land, and the soil is deeply plowed to a depth of 0.2m.

[0045] 2) Apply the passivation material to the soil, the use amount of the passivation material is 20kg per mu, and the passivation material and the soil are fully mixed evenly through the tillage machinery.

[0046] Wherein, the passivation material is composed of the following materials in parts by weight: 15 parts of montmorillonite powder, 25 parts of calcite powder, 25 parts of limestone powder, and 10 parts of magnesite powder.

[0047] 3) Use a heating fan to control the temperature at 80° C. to dry the soil for 5 days.

[0048] 4) Plant pak choy by drip irrigation on the soil treated in step 3), and apply water-soluble fertilizer from time to time. Wherein, the water-soluble fertilizer includes by weight: 2 parts of urea, 5 parts of potassium superphosphate and 3 parts of sodium selenite.

Embodiment 2

[0050] 1) The soil is selected from the alkaline cadmium-contaminated greenhouse soil in the northern dry land, and the soil is deeply plowed to a depth of 0.5m.

[0051] 2) Apply the passivation material to the soil, the use amount of the passivation material is 25kg per mu, and the passivation material and the soil are fully mixed evenly through the tillage machinery.

[0052] Wherein, the passivation material is composed of the following materials in parts by weight: 15 parts of montmorillonite powder, 25 parts of calcite powder, 25 parts of limestone powder, and 10 parts of magnesite powder.

[0053] 3) Use a heating fan to control the temperature at 80° C. to dry the soil for 5 days.

[0054] 4) Plant pak choy by drip irrigation on the soil treated in step 3), and apply water-soluble fertilizer from time to time. Wherein, the water-soluble fertilizer includes by weight: 2 parts of urea, 5.5 parts of potassium superphosphate and 3 parts of sodium selenite.

Embodiment 3

[0056] 1) The soil is selected from the alkaline cadmium-contaminated greenhouse soil in the northern dry land, and the soil is deeply plowed to a depth of 0.4m.

[0057] 2) Apply the passivation material to the soil, the use amount of the passivation material is 18kg per mu, and the passivation material and the soil are fully mixed evenly through the tillage machinery.

[0058] Wherein, the passivation material is composed of the following substances by weight: 15 parts of kaolinite powder, 25 parts of calcite powder, 25 parts of dolomite powder, and 15 parts of magnesite powder.

[0059] 3) Use a heating fan to control the temperature at 60° C. to dry the soil for 7 days.

[0060] 4) Plant pak choy by drip irrigation on the soil treated in step 3), and apply water-soluble fertilizer from time to time. Wherein, the water-soluble fertilizer includes by weight: 2 parts of urea, 6 parts of potassium superphosphate and 3 parts of sodium selenite.

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Abstract

The invention provides a method for lowering the harmful heavy metal concentration of crops, and aims to reduce the absorption of harmful heavy metals by the crops. Through an in-situ passivation technology and regulation of an agronomic measure, a coupling technology for isolating passivation from agriculture is researched and developed to ensure safe crop production in dryland soil in China. Themethod comprises the following steps: uniformly mixing deeply-ploughed polluted soil with a passivation material, and then heating and drying the polluted soil mixed with the passivation material; then planting crops in the heated and dried soil by an irrigation method combining drip irrigation and/or an air spray method, and irregularly applying water-soluble fertilizer of a special proportion in an irrigation method. The method is low in cost, is convenient to operate, has a remarkable soil passivation effect, can realize long-term passivation, can remarkably lower the content of heavy metals in the crops, is suitable for dryland crop planting soil, especially dryland greenhouse soil, has a wide practical application prospect, and is easy for realizing large-scale operation.

Description

technical field [0001] The invention relates to the field of farmland soil pollution restoration, in particular to a method for reducing the concentration of harmful heavy metals in crops. Background technique [0002] With the rapid development of industrial and agricultural production technology, a large number of pollutants have entered the soil environment, resulting in increasingly serious soil pollution. The main ways for pollutants to enter the soil environment are unreasonable mineral mining, massive irrigation of sewage and wanton use of pesticides. According to the report of the State Environmental Protection Administration, the area of ​​cultivated land polluted by heavy metals such as Cd, As, Cr, and Pb in my country is nearly 2.0×10 7 hectares, accounting for about 1 / 5 of the total cultivated land area. Moreover, heavy metal pollution in farmland soil enters crops through the food chain, and eventually causes poisoning to humans and animals, seriously threaten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/08
Inventor 朱润良傅浩洋陈情泽朱建喜何宏平
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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