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A method of increasing the ability of tobacco to remove soil cadmium by using fertilization and mowing technology

A tobacco and soil technology, applied in the field of phytoremediation, can solve the problems of small comprehensive effect of practical application, less total amount of absorbed and accumulated heavy metals, and low biomass in the aboveground parts, and achieves low management costs, large biomass, and developed aboveground parts. Effect

Active Publication Date: 2017-04-26
HUNAN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to, aiming at the deficiencies in the above-mentioned prior art, provide a kind of method that utilizes fertilization and mowing technology to increase the ability of tobacco to remove soil cadmium, so as to solve the seasonal restrictions, slow growth, and Problems such as low aboveground biomass, low total amount of absorbed and accumulated heavy metals, poor economic benefits, and little comprehensive effect of practical application

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  • A method of increasing the ability of tobacco to remove soil cadmium by using fertilization and mowing technology
  • A method of increasing the ability of tobacco to remove soil cadmium by using fertilization and mowing technology

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Embodiment 1

[0015] Example 1 Soil remediation test in cadmium polluted area

[0016] Approach:

[0017] The distribution of cadmium in tobacco plants was investigated using test pots with a diameter of 31 cm and a height of 28 cm. Each pot was filled with 15 kg of soil. The soil was collected from a tobacco field in eastern Hunan. The heavy metal cadmium content in the soil was 0.587 mg / kg and the pH value was 4.77. . In March 2014, tobacco seedlings of Yunyan 87, Yunyan 97, K326, and Xiang 3 were transplanted into test pots, with 1 plant in each pot, and 3 replicates for each variety. The same routine management was adopted in each test pot (using local customary management). Harvested after planting 60 days (i.e. maturity stage), and the tobacco leaves were sampled in sections, taking 1 to 5 leaves as the lower leaves, 6 to 10 leaves as the middle leaves, and 11 to 15 leaves as the upper leaves, and determined the concentration of heavy metals in 4 different tobacco leaves. The conte...

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Abstract

The invention provides a method for improving the soil cadmium removal capability of tobacco by use of a fertilization and harvesting technology. The method comprises the following steps of: transplanting tobacco seedlings to heavy metal cadmium contaminated soil according to a natural growing period of the tobacco seedlings, performing conventional cultivation, applying additional fertilizers during a vigorous growing period, and harvesting tobacco after the tobacco seedlings are mature; and performing conventional cultivation again, and applying additional fertilizers so as to promote growth of regenerated tobacco, so that the cadmium absorption and enrichment capability is improved by virtue of application of additional fertilizers and the growing process of regenerated tobacco, and thus the purpose of removing excessive cadmium in soil is achieved. The tobacco seedlings can grow normally in cadmium contaminated soil without obvious toxic symptoms and influence on tobacco yield, and the tobacco seedlings can be regenerated; furthermore, the overground part of the tobacco is large in biomass, so that a large amount of heavy metal cadmium can be absorbed and accumulated. The method provided by the invention is relatively simple in cultivation and low in management cost; harvesting can be performed twice through once planting; tobacco has relatively high protein content; after being treated, tobacco can serve as a feed, and heavy metals can be prevented from entering a food chain again by virtue of a utilization mode of the tobacco, so that certain economical benefits can be achieved while pollution is treated.

Description

technical field [0001] The invention relates to a phytoremediation technology for polluted environment, in particular to a method for remediating soil heavy metal pollution by increasing the ability of economic crop tobacco to remove soil cadmium by using fertilization and mowing technology. Background technique [0002] Long-term industrial and agricultural activities, a large number of industrial pollutants and urban waste have been diverted to the agricultural environment, so that a large number of farmland in my country is threatened by heavy metals and other pollutants. There are 300 million mu of cultivated land in the country polluted by heavy metals, accounting for 1 / 6 of the total farmland in the country. . Every year, 12 million tons of grains are polluted by heavy metals, causing direct economic losses of more than 20 billion yuan. Among all heavy metal pollution, cadmium pollution is particularly prominent. Based on my country's population pressure and food secu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
CPCB09C1/105
Inventor 曾清如周细红晏哲陈璘涵
Owner HUNAN AGRICULTURAL UNIV
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