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Safe cultivation method for alkalescent cadmium-contaminated soil

A cadmium-contaminated soil and weakly alkaline technology is applied in the restoration of polluted soil, soil lifting machinery, agricultural machinery and tools, etc. It can solve the problem that the repair rate is less than 3%, and achieve simple farming methods, easy operation, Yield improvement effect

Pending Publication Date: 2022-02-25
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the remediation of heavy metal-contaminated soil has just started in my country, and the current remediation rate is less than 3%.
The soil in southern my country is slightly acidic. In the weakly acidic cadmium-contaminated soil, the passivation of heavy metals can be achieved by increasing the soil pH value. pH for Safe Use of Contaminated Soils

Method used

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  • Safe cultivation method for alkalescent cadmium-contaminated soil
  • Safe cultivation method for alkalescent cadmium-contaminated soil
  • Safe cultivation method for alkalescent cadmium-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: the preparation of modified biochar

[0039] Add 10g of biochar to 150ml of 0.5mol / L KMnO 4 The solution was stirred with a magnetic stirrer for 30 minutes, and the biochar was filtered and rinsed with distilled water until the filtrate was colorless. Transfer biochar into 200ml 5mol / L KOH solution, stir with a magnetic stirrer for 1 hour, then add 179.6ml 1mol / L FeCl 3 The solution was stirred for 2 hours. The biochar was suction filtered and rinsed with distilled water three times, and then the biochar was dried in an oven at 75°C. The obtained iron-manganese modified biochar is in the form of powder, and iron and manganese are attached to the surface of the biochar in the form of oxides. XPS diagram see figure 1 and figure 2 .

Embodiment 2

[0040] Embodiment 2: the safe cultivation of millet

[0041] Before sowing, apply the iron-manganese modified biochar 1500kg / mu that adopts the method for embodiment 1 to prepare; Then, deep plow 30cm; Apply physiological alkaline fertilizer, reduce the biological activity of cadmium, apply 15-10-15 per mu of land Nitro compound fertilizer 66kg, urea 10.87kg. Sow Liaofenggu No. 3 for daily management.

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Abstract

The invention discloses a safe cultivation method for alkalescent cadmium-polluted soil. The method comprises the following steps: before sowing, applying modified biochar into the soil; turning over the soil; and applying a nitro-compound fertilizer and urea, sowing crops, and performing daily management. The modified biochar is prepared through the following steps: adding biochar into a KMnO4 solution, conducting stirring, filtering the biochar, and carrying out washing with distilled water until a filtrate is colorless; transferring the biochar into an alkaline solution, and carrying out stirring; and adding the treated biochar into a FeCl3 solution, performing stirring, carrying out suction filtration on the biochar, carrying out washing with distilled water, and drying the biochar to obtain the iron-manganese modified biochar. According to the invention, the modified biochar is combined with deep ploughing or rotary tillage, and is combined with an optimized fertilization mode to realize combined action and synergistic interaction, so a cadmium content in grains of crops planted in the cadmium-polluted soil is effectively reduced, and the yield of crops is increased.

Description

technical field [0001] The invention relates to the technical field of safe planting of crops, in particular to a safe cultivation method for weakly alkaline cadmium-contaminated soil. Background technique [0002] Soil is one of the main natural resources that human beings depend on for survival, and it is also an important part of the ecological environment. Due to the increasing scale of industrial and agricultural production, the waste water and waste residues are also increasing. These wastes not only destroy the surface vegetation, but also The toxic and harmful heavy metals in it will also enter the surrounding soil environment with the discharge of wastewater and the weathering and leaching of waste residue piles, affecting the growth of surface organisms, and can enter the human body and other animals through food chains and other channels for enrichment, affecting human health. [0003] The accumulation of heavy metals in farmland to a certain extent not only reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08A01B77/00
CPCB09C1/00B09C1/08A01B77/00B09C2101/00
Inventor 娄燕宏康锡瑞诸葛玉平王会潘红杨全刚孙铭婕李亚平耿娜于金鹏李旭
Owner SHANDONG AGRICULTURAL UNIVERSITY
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