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A method for reducing cadmium content in vegetables planted in cadmium-contaminated soil

A technology for cadmium contamination of soil and vegetables, applied in the fields of botanical equipment and methods, horticulture, cultivation, etc., can solve the problems of large amount of engineering, decreased soil fertility, damage to soil structure, etc., to improve safety and reduce Cd content , the effect of increasing crop yield

Active Publication Date: 2017-11-07
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can reduce the Cd pollution on the soil surface and the Cd content in the vegetable body, the amount of engineering is large, the investment cost is high, the soil structure is destroyed, and the soil fertility is reduced.
2. Chemical remediation, put amendments (such as lime, zeolite, calcium carbonate) into the soil to reduce the bioavailability of Cd through the adsorption, redox, antagonism or precipitation of Cd, but it only changes the Cd in the soil In the existing form, Cd remains in the soil and is easily reactivated to harm plants
Although this method has no secondary pollution, it is slow to take effect and has a long cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The research object of this example is the soil containing 3mg / kg Cd. Each test area is 1m 2 , a total of 7 test areas were set; each was mixed with a compound fertilizer (N:P 2 o 5 :K 2 O=17:17:17, total nutrient>51%), the mixed amount is nitrogen fertilizer containing 240kg N (nitrogen), phosphate fertilizer 105kg P (phosphorus) and potassium fertilizer 199kg K (potassium) per hectare (equivalent to 1m 2 The amount of nitrogen fertilizer is nitrogen fertilizer containing 24gN (nitrogen), phosphate fertilizer 10.5g P (phosphorus) and potassium fertilizer 19.9g K (potassium). kg soil, the potassium content is 332mg K / kg soil).

[0027] The vegetable for testing is Chinese cabbage (the variety is Dongfei), and the seedling is covered with soil about twice the diameter of the seed, and the seedlings emerge in about 3-5 days. Optimal temperature for germination: 15-25°C. Germination time: 7-10 days.

[0028] Each test area is carried out as follows:

[0029] (1) Fu...

Embodiment 2

[0040] Change "the soil containing Cd 3mg / kg" into "the soil containing Cd 5mg / kg" in Example 1, and all the other are the same as in Example 1. The results obtained are shown in Table 2:

[0041] Table 2 The index comparison of Chinese cabbage when the soil Cd treatment concentration is 5mg / kg

[0042]

Embodiment 3

[0044] Change "the soil containing Cd 3mg / kg" into "the soil containing Cd 1mg / kg" in Example 1, and all the other are the same as in Example 1. The results obtained are shown in Table 3:

[0045]

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PUM

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Abstract

The invention discloses a method for reducing cadmium content in vegetables planted in cadmium-contaminated soil, which comprises the following steps: spreading a layer of matrix on the surface of cadmium-contaminated soil, planting vegetables, and keeping the water holding capacity of the soil at 60-70%; Spray the Azospirillum brasilense bacterial solution with the preservation number CGMCC 1.10379 on the vegetable rhizosphere soil. The invention can effectively slow down the toxicity of soil Cd to crops, increase the yield of vegetables, reduce the content of Cd in crops, and prevent Cd from entering the food chain with crops to endanger human health.

Description

technical field [0001] The invention relates to the technical field of heavy metal-contaminated soil treatment, in particular to a method for reducing cadmium content in vegetables planted in cadmium-contaminated soil by using Azospirillum brasiliensis. Background technique [0002] Since the discovery of Cd in the early 20th century, Cd has been widely used in electroplating industry, chemical industry, electronics industry and nuclear industry and other fields, and a considerable amount of Cd is discharged into the environment through waste gas, waste water and waste residue. In 2014, the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the rate of Cd pollutant points in my country's cultivated land exceeded the standard by 7.0%. The soil in the suburbs of most cities in my country has been polluted by Cd to a certain extent, and these Cd-contaminated soils are often used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G1/00A01G9/10
Inventor 张然然张鹏胡浩源都韶婷
Owner ZHEJIANG GONGSHANG UNIVERSITY
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