Method for enhancing extraction of heavy metal in farmland by sugarcane through root system secretion

Abstract

The invention belongs to the technical field of biology, and discloses a method for enhancing extraction of heavy metal in a farmland by sugarcane through root system secretion. The method includes the following steps of firstly, planting a proper species of sugarcane in the farmland with the heavy metal (cadmium) exceeding the standard; secondly, dissolving oxyl hydroximic acid in water to form asolution with the concentration of 0.01-0.1 mM, and applying the solution in the elongation period of the sugarcane according to the spraying amount of 10-15 t / mu; thirdly, conducting spraying for 7-15 days, measuring soil, and complementarily spraying a sodium oxyl hydroximic acid salt water solution 1-2 times if the activity of cadmium in the soil is low; fourthly, harvesting the sugarcane andremoving the sugarcane plant out of the farmland. By adding the oxyl hydroximic acid, the oxyl hydroximic acid has a quite high chelating effect on the heavy metal under the alkaline environment, andthe migration of the heavy metal in the soil and a plant body is promoted; the oxyl hydroximic acid is the secretion generated by microorganisms, and ferrite with the quite high complexing capacity onthe heavy metal causes no toxic harm to the environment, is quite easy to degrade and has quite high practicability in farmland environment, agricultural production and the like.

Description

technical field [0001] The invention specifically relates to a method for using root exudates to strengthen sugarcane to extract heavy metals in farmland, and belongs to the field of biotechnology. Background technique [0002] The excessive rate of heavy metal points in cultivated land soil in my country is 19.4%, with moderate and light levels accounting for 94.3%, mainly cadmium. The Action Plan for Soil Pollution Prevention and Control promulgated in 2016 clearly stated that by 2020, the safe utilization rate of polluted cultivated land will reach about 90%, and the safe utilization rate of polluted plots will reach more than 90%. Passivation and extraction technologies are the two main restoration methods for farmland soil. Japan's Niigata Agricultural Research Institute (Toshimitsu Honma, 2016) proposed to use appropriate irrigation water regulation technology to make the pH and Eh in the soil passivate cadmium. Guangdong Provincial Institute of Eco-environment and S...

AI Technical Summary

Problems solved by technology

[0006] Although sugarcane has a strong absorption effect on heavy metal cadmium, when the bioavailability of cadmium in the soil is low, the absorption capacity is poor

Especially in farmlands in Hunan, Jiangxi, Hubei, Fujian and other places, the soil pH is often higher than 6.0, the Cd migration performance is low, and plant extraction is difficult