A method for repairing heavy metal pollution in farmland soil
A remediation method and heavy metal technology, applied in the restoration of contaminated soil, etc., can solve the problems of reducing soil use efficiency and high leaching risk of heavy metals, and achieve the effects of reducing leaching risk, improving soil microbial activity, and having a wide range of sources
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Embodiment 1
[0036] This embodiment provides a method for repairing heavy metal pollution in farmland soil, which specifically includes the following steps,
[0037] In late March, plow and mix the modified vermiculite with the soil. The depth of plowing is 30cm, the dosage of passivator is 100kg / mu, and then curing for 15 days; Management: Harvest wheat in early July, recycle the straw, and plow the farmland; plant the hyperaccumulative plant Solanum nigrum, and apply the activator at the same time, 6kg / mu, and apply the activator once every 15 days with water;
[0038] Harvest nightshade in late August. After plowing the land, plow and mix the heavy metal passivation agent with the soil. The depth of plowing is 30cm, the dosage of passivation agent is 100kg / mu, and then maintain for 15 days; during the autumn and winter stubble period, plant in early September Millet, under normal management, after harvesting in late November, plant the hyperaccumulator plant Solanum nigrum, and apply ac...
Embodiment 2
[0040] This embodiment provides a method for repairing heavy metal pollution in farmland soil, which specifically includes the following steps,
[0041] In mid-March, the modified biochar was plowed and mixed with the soil, the depth of plowing was 30cm, the dosage of passivator was 120kg / mu, and then maintained for 15 days; then, during the spring stubble period, wheat was planted in early April. Management: Harvest wheat in the first ten days of July, recycle the straw, and plow the farmland; plant the super-accumulator vetiver, and apply the activator at the same time, 8kg / mu, and apply the activator once every 15 days with water;
[0042] Harvest vetiver in late August, then plow and mix the heavy metal passivator with the soil, the depth of plowing is 30cm, the dosage of passivator is 120kg / mu, and then maintain for 15 days; during the autumn and winter stubble period, plant in early September Millet, under normal management, after harvesting in late November, plant vetiv...
Embodiment 3
[0044] This embodiment provides a method for repairing heavy metal pollution in farmland soil, which specifically includes the following steps,
[0045] In mid-March, a mixture of modified vermiculite, modified biochar and modified sepiolite with a mass ratio of 3:1:1 was used as a passivator, and mixed with the soil until the soil was plowed to a depth of 10 cm. The amount of chemical agent is 50kg / mu, and then maintain for 15 days; then, during the spring stubble period, plant broad beans in early April, manage them normally, harvest in early July, and then cultivate the farmland; Apply activator, 3kg / mu, apply activator once every 15 days with water;
[0046] Harvest Sedum sedum in late August, then plow and mix the heavy metal passivation agent with the soil, the depth of plowing is 30cm, the dosage of passivation agent is 50kg / mu, and then maintain for 15 days; during the autumn and winter stubble period, plant in early September Sweet potato, under normal management, af...
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