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Method for repairing cadmium-contaminated black soil by inter-cropping solanum nigrum L and soybeans

A technology for phytoremediation and cadmium pollution, which is applied in the field of phytoremediation of cadmium-contaminated black soil by using nightshade and soybean intercropping, can solve the problems of low soil treatment efficiency, and achieve the effect of benefiting nutrient absorption and growth promotion

Inactive Publication Date: 2019-05-03
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is less efficient for soil treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment includes the following steps:

[0026] A. Plow the land to be repaired. The plowing depth is 30cm. Evenly sprinkle 20g / ㎡ calcium phosphate and 8g / ㎡ potassium nitrate in the plowed land. The mixture of calcium phosphate and potassium nitrate is divided into three layers. Lay and cushion soil layer between each layer of mixture;

[0027] B. Fertilize the plowed land. The fertilizers for fertilization include,

[0028] Plant ash at 3g / ㎡, urea at 7g / ㎡, magnesium sulfate at 1g / ㎡, sodium molybdate at 0.6g / ㎡, zinc sulfate at 4g / ㎡, copper sulfate at 2g / ㎡, animal manure at 35g / ㎡;

[0029] C, plant nightshade seedlings on the plowed land;

[0030] D, 3 weeks after planting Solanum nigrum, carry out topdressing;

[0031] After E, topdressing one week, soybean is planted; First dig a pit on the surface of the soil layer, the depth of the pit is 5cm, plant soybean seedlings in the pit, after planting, lay a circular fence with a height of 1.5cm on the outside of t...

Embodiment 2

[0042] This embodiment is improved on the basis of Embodiment 1. On the basis of the disinfectant formula in Example 1, 4 parts of lotus seed hearts and 5 parts of Wujiapi were added. Lianzixin and Wujiapi can effectively improve the lodging resistance of soybeans, thereby improving the growth of soybeans.

Embodiment 3

[0044] This embodiment is improved on the basis of Embodiment 2. 12 hours after each watering, carry out topdressing again, topdressing fertilizer is,

[0045] 5g / ㎡ of urea, 4g / ㎡ of plant ash and 15g / ㎡ of animal manure. Topdressing after watering can effectively prevent the decline of soil fertility and improve the growth of crops.

[0046] Use above-mentioned 3 embodiments and the remediation method that background technology quotes to carry out comparative remediation experiment on the same piece of cadmium-contaminated land (the cadmium content before soil remediation is 5.6mg / kg, and remediation cycle is a planting cycle), the results are as follows:

[0047]

[0048] It can be seen from the above table that the restoration method of the present invention can effectively improve the plant's absorption efficiency of cadmium in the soil.

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PUM

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Abstract

The invention discloses a method for repairing cadmium-contaminated black soil by inter-cropping solanum nigrum L and soybeans. The method comprises the following steps that A, tillage is conducted ona land to be repaired, the depth of the tillage is 20-30 cm, calcium phosphate and potassium nitrate are evenly sprinkled in the tillage land, a mixture of the calcium phosphate and the potassium nitrate is sprinkled in three layers, and a wood pad layer is laid between layers of the mixture; B, fertilization is carried out on the tillage land; C, seedlings of the solanum nigrum L are planted onthe tillage land; D, 3-4 weeks after the solanum nigrum L is planted, topdressing is carried out; E, one week after the topdressing, the soybeans are planted, firstly, pits are dig on the surface of the soil, soybean seedlings are planted in the pits, and the outer sides of the soybean seedlings are laid with a circular fence after planting; F, watering is conducted on the land every other week, adisinfectant is added to the circular fence every two weeks for disinfection, and weeds in crops are removed. The method is capable of improving the deficiencies of the prior art and improving the efficiency of absorption of heavy metal contaminants in the soil.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a method for remediating cadmium-contaminated black soil by using black nightshade and soybean intercropping plants. Background technique [0002] With the development of industry and the modernization of agricultural production, the problem of heavy metal pollution in the soil-plant-environment system is becoming more and more serious. The natural purification process of heavy metals in the soil is very long. Once the soil is polluted, the harm will be long-term. It not only seriously endangers crop production, but also enters the food chain and endangers the health of humans and animals. In my country, more than 300 million mu of farmland has been polluted by heavy metals; the number of grains, vegetables and agricultural by-products polluted by pesticides and heavy metals has increased sharply, and the direct economic losses caused by agri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02A01C21/00A01G22/00A01G22/40
Inventor 李继光孙慧王其传娄翼来李贵春闫有喜王树伟周英明蓝声宁韦春晓邱清华许竣李达耀黄莹娜林振良
Owner QINZHOU UNIV
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