Method for reducing adsorption of brassica chinensis on heavy metal lead with natural zeolite

Abstract

The invention relates to a method for reducing adsorption of brassica chinensis on heavy metal lead with natural zeolite. The method comprises the following steps: 1) adding natural zeolite consistingof clinoptilolite and mordenite into heavy metal lead polluted soil, and uniformly mixing; 2) applying a base fertilizer to the soil mixed with the natural zeolite, then standing and curing for 3-5 months, and maintaining the moisture content of the soil to be 28-32% in the curing process; and 3) sowing brassica chinensis seeds into the cured soil, and culturing until harvesting; wherein the natural zeolite is preferably Australian Aolun natural zeolite, and the model of the natural zeolite is FM 3/1, FM 16-50 or ANZ38. After the zeolite is added in proportion, the dry weight of brassica chinensis can be remarkably increased, and the cation exchange capacity of soil is increased. The lead reduction amplitude of the overground part of brassica chinensis is 13.76-63.66% after applying of zeolite FM 3/1 to, and the maximum lead reduction amplitude is achieved when the applying amount is 0.1%; the lead reduction amplitude of the overground part of brassica chinensis is 49.52-69.61% afterapplying of zeolite FM 16-50, and the maximum reduction amplitude is achieved when the applying amount of zeolite FM 16-50 is 3%; the lead reduction amplitude of the overground part of the brassica chinensis is 26.79-37.35% after applying of zeolite ANZ38, and the maximum reduction amplitude is achieved when the applying amount of zeolite ANZ38 16-50 is 3%.

Description

technical field [0001] The invention belongs to the field of farmland soil heavy metal pollution restoration and relates to a method for reducing the lead content in the aboveground part of small green vegetables. [0002] technical background [0003] The heavy metal lead (Pb) is a non-essential element for plants, and a trace amount will cause toxicity to plants. Human mining, metallurgy, electroplating, and the production and use of lead-containing paint, gasoline, explosives, sludge, etc. have released a large amount of lead into the environment. In the past 50 years, the world's Pb emissions have reached approximately 7.83×10 5 t, most of them enter the soil environment, resulting in different degrees of Pb pollution in the soil of various countries in the world. The 2014 "Soil Pollution Survey Bulletin" shows that the rate of lead in my country's soil is 1.5%. One of the main pollutants exceeding the standard. Soil Pb pollution affects crop yield and quality, and enda...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of excessive absorption of heavy metal lead in the planting process of small green vegetables in the prior art, and to provide a method for reducing the absorption of heavy metal lead by small green vegetables

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