A method for regulating and remediating cadmium-contaminated farmland soil while producing

Abstract

The invention discloses a regulation and control method for cadmium contaminated farmland soil to produce while repairing. The method includes performing air-drying and sieving on cadmium contaminatedsoil, applying a regulator component A, B and C, applying urea, and performing uniform mixing; planting paddy rice, performing drying for 3 days except for the later period of a tillering stage, maintaining a water layer of 2-3 cm at other time, performing frying until 3 days before harvest, and harvesting the paddy rice; performing re-air drying and sieving on the soil, applying a regulator component D and E, applying the urea, and performing uniform mixing; planting sedum plumbizincicola, maintaining the moisture of the soil at 60%-70% of maximum field water holding capacity, and harvestingthe upper parts of the sedum plumbizincicola after 4-6 months of planting; and repeating the above steps for 2-5 times so that repairing can be completed. The dual-purpose of guaranteeing the safe production of the paddy rice and accelerating repairing process can be achieved. The method can simultaneously consider the standard achieved production of the paddy rice on the contaminated soil and the efficient repairing of the sedum plumbizincicola.

Description

technical field

[0001] The invention relates to a treatment technology for heavy metal-contaminated soil, in particular to a control method for repairing cadmium-contaminated farmland soil accompanied by sedum-rice rotation during production. Background technique

[0002] With the rapid development of my country's industrialization and urbanization in recent decades, the problem of heavy metal pollution in farmland soil has become increasingly prominent. Cadmium (Cd) pollution in farmland soil not only has a toxic effect on crops and reduces the yield and quality of crops, but also can be absorbed by the human body through soil-crop-food migration and endanger human health. Therefore, it is urgent to treat heavy metal-contaminated soil.

[0003] Depending on the pollution degree of heavy metals in the soil, different utilization and restoration measures can be taken. For heavily polluted soil, it is usually no longer suitable for growing edible agricultural products, and th...

Examples

Embodiment 1

[0027] This example verifies the effects of P and Zn treatments in the rice season on rice and Sedum sedum with ore after cropping

[0028] 1 Materials and methods

[0029] The test soil was collected from a Cd pollution remediation base in Xiangtan, Hunan Province, with a Cd content of 0.28 mg·kg. -1 , Zn content 73mg·kg -1 , pH value is 4.63, organic matter content is 31.2g·kg -1 , the total nitrogen, phosphorus and potassium contents are 1.50, 0.40 and 11.8g·kg respectively -1 , the contents of available nitrogen, phosphorus and potassium are 93.0, 0.68 and 56.0mg·kg respectively -1 . The soil to be tested was air-dried and passed through a nylon sieve with a pore size of 2 mm. The tested rice was the short growth period variety W184 and the seedlings of Sedum sedum with ore.

[0030] Apply 0.5g·kg of urea uniformly to all soils in the pot test -1 , K 2 HPO 4 0.74g·kg -1 As base fertilizer (containing P100mg·kg -1 ), on this basis, a total of 5 treatments were s...

Embodiment 2

[0049] This example verifies the effect of rice season sulfate treatment on rice and Sedum sedum with ore

[0050] 1 Materials and methods

[0051] The soil for the test was collected from the surface layer of 0-20cm of farmland in Taicang, Jiangsu, and the parent material paddy soil of river alluvial, the total amount of Cd in the soil was 1.2mg·kg -1 , pH 6.4, organic matter content 54.1g·kg -1 , total nitrogen 1.80g·kg -1 , available phosphorus 55.0mg·kg -1 , available potassium 150mg·kg -1 . The soil was air-dried and passed through a 10-mesh (2mm) sieve. Greenhouse pot experiments were adopted, with a total of 1.5 kg of soil in each pot. And according to N100mg·kg -1 , P 30mg·kg -1 , K 80mg·kg -1 Add base fertilizer. Three treatments were set up, and sodium sulfate (Na 2 SO 4 )0, 151.5, 302.9 mg·kg -1 , namely SO 4 2- Concentrations are 0, 90, 180mg·kg -1 . Each treatment was replicated 4 pots.

[0052] Transplant 6 rice seedlings (the variety is Xiangza...

Embodiment 3

[0061] This example verifies the effect of sulfur treatment on sedum with ore and rice in the next season

[0062] 1 Materials and methods

[0063] The soil for the test was collected from the surface layer of 0-20cm of farmland in Taicang, Jiangsu, and the parent material paddy soil of river alluvial, the total amount of Cd in the soil was 1.2mg·kg -1 , pH 6.4, organic matter content 54.1g·kg -1 , total nitrogen 1.80g·kg -1 , available phosphorus 55.0mg·kg -1 , available potassium 150mg·kg -1 . The soil was air-dried and passed through a 10-mesh (2mm) sieve. Using the greenhouse pot test, each pot is filled with 1.5kg of soil, and according to N100mg·kg -1 , P 30mg·kg -1 , K 80mg·kg -1 Add base fertilizer. Set 3 treatments, add 0, 0.5, 2g·kg -1 Sulfur powder (60 mesh), each treatment repeated 4 pots (S0, S0.5, S2).

[0064] Cutting 4 Sedum sedum seedlings per pot were inserted into a 10cm soil solution sampler at a 45-degree angle, poured deionized water every day ...

technical field

[0001] The invention relates to a treatment technology for heavy metal-contaminated soil, in particular to a control method for repairing cadmium-contaminated farmland soil accompanied by sedum-rice rotation during production. Background technique

[0002] With the rapid development of my country's industrialization and urbanization in recent decades, the problem of heavy metal pollution in farmland soil has become increasingly prominent. Cadmium (Cd) pollution in farmland soil not only has a toxic effect on crops and reduces the yield and quality of crops, but also can be absorbed by the human body through soil-crop-food migration and endanger human health. Therefore, it is urgent to treat heavy metal-contaminated soil.

[0003] Depending on the pollution degree of heavy metals in the soil, different utilization and restoration measures can be taken. For heavily polluted soil, it is usually no longer suitable for growing edible agricultural products, and th...

Examples

Embodiment 1

[0027] This example verifies the effects of P and Zn treatments in the rice season on rice and Sedum sedum with ore after cropping

[0028] 1 Materials and methods

[0029] The test soil was collected from a Cd pollution remediation base in Xiangtan, Hunan Province, with a Cd content of 0.28 mg·kg. -1 , Zn content 73mg·kg -1 , pH value is 4.63, organic matter content is 31.2g·kg -1 , the total nitrogen, phosphorus and potassium contents are 1.50, 0.40 and 11.8g·kg respectively -1 , the contents of available nitrogen, phosphorus and potassium are 93.0, 0.68 and 56.0mg·kg respectively -1 . The soil to be tested was air-dried and passed through a nylon sieve with a pore size of 2 mm. The tested rice was the short growth period variety W184 and the seedlings of Sedum sedum with ore.

[0030] Apply 0.5g·kg of urea uniformly to all soils in the pot test -1 , K 2 HPO 4 0.74g·kg -1 As base fertilizer (containing P100mg·kg -1 ), on this basis, a total of 5 treatments were s...

Embodiment 2

[0049] This example verifies the effect of rice season sulfate treatment on rice and Sedum sedum with ore

[0050] 1 Materials and methods

[0051] The soil for the test was collected from the surface layer of 0-20cm of farmland in Taicang, Jiangsu, and the parent material paddy soil of river alluvial, the total amount of Cd in the soil was 1.2mg·kg -1 , pH 6.4, organic matter content 54.1g·kg -1 , total nitrogen 1.80g·kg -1 , available phosphorus 55.0mg·kg -1 , available potassium 150mg·kg -1 . The soil was air-dried and passed through a 10-mesh (2mm) sieve. Greenhouse pot experiments were adopted, with a total of 1.5 kg of soil in each pot. And according to N100mg·kg -1 , P 30mg·kg -1 , K 80mg·kg -1 Add base fertilizer. Three treatments were set up, and sodium sulfate (Na 2 SO 4 )0, 151.5, 302.9 mg·kg -1 , namely SO 4 2- Concentrations are 0, 90, 180mg·kg -1 . Each treatment was replicated 4 pots.

[0052] Transplant 6 rice seedlings (the variety is Xiangza...

Embodiment 3

[0061] This example verifies the effect of sulfur treatment on sedum with ore and rice in the next season

[0062] 1 Materials and methods

[0063] The soil for the test was collected from the surface layer of 0-20cm of farmland in Taicang, Jiangsu, and the parent material paddy soil of river alluvial, the total amount of Cd in the soil was 1.2mg·kg -1 , pH 6.4, organic matter content 54.1g·kg -1 , total nitrogen 1.80g·kg -1 , available phosphorus 55.0mg·kg -1 , available potassium 150mg·kg -1 . The soil was air-dried and passed through a 10-mesh (2mm) sieve. Using the greenhouse pot test, each pot is filled with 1.5kg of soil, and according to N100mg·kg -1 , P 30mg·kg -1 , K 80mg·kg -1 Add base fertilizer. Set 3 treatments, add 0, 0.5, 2g·kg -1 Sulfur powder (60 mesh), each treatment repeated 4 pots (S0, S0.5, S2).

[0064] Cutting 4 Sedum sedum seedlings per pot were inserted into a 10cm soil solution sampler at a 45-degree angle, poured deionized water every day ...

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