Method for improving soil cadmium removal capability of tobacco by use of fertilization and harvesting technology

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...

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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