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
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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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