Method for promoting economic crop ricinus communis to repair copper and cadmium combined polluted soil

Abstract

The invention discloses a method for promoting economic crop ricinus communis to repair copper and cadmium combined polluted soil. The method comprises the following steps: applying a nitrogen fertilizer and a potassium fertilizer which are used as base fertilizers into the naturally air-dried copper and cadmium combined polluted soil, and simultaneously applying a phosphate fertilizer into the naturally air-dried copper and cadmium combined polluted soil; the method comprises the following steps: soaking castor seeds in an ethanol solution and sterilized distilled water in sequence, and then sowing the castor seeds in mixed soil for culture; applying an ethylenediamine disuccinic acid solution into the soil 20-30 days after the castor seeds grow two leaves, and continuing planting until harvesting. Through the combined action of the phosphate fertilizer and the EDDS, the absorption of the castor to copper and cadmium is promoted, on one hand, the phosphate fertilizer can relieve heavy metal stress, promote plant growth and promote transfer of heavy metal to the overground part, and on the other hand, the EDDS activates copper and cadmium in soil, the absorption of a root system to copper and cadmium is increased, and the metal concentration of the overground part is increased. The phosphate fertilizer and EDDS are jointly applied, so that the biomass and copper-cadmium concentration of the overground part of the plant are increased, and the phytoremediation efficiency is enhanced. The operation is simple and easy, and the repairing time is shortened.

Description

technical field [0001] The invention relates to the field of soil heavy metal pollution phytoremediation, in particular to a method for promoting economic crop castor to restore copper and cadmium composite polluted soil. Background technique [0002] In recent years, due to frequent industrial and agricultural activities, soil heavy metal pollution has attracted continuous attention from the society. The farmland soil pollution caused by mining activities has brought potential threats to human health and the ecological environment. The mining of copper mines leads to the content of copper in the soil around the mining area exceeding the standard of farmland soil (Document 1 Xia Jiaqi. Detailed Explanation of Soil Environmental Quality Standards [M]. Beijing: China Environmental Science Press, 1996.), and often accompanied by pollution of other heavy metals Such as cadmium, arsenic, lead and so on. According to the National Soil Pollution Survey Bulletin, the national soil...

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Problems solved by technology

Chelating agent-enhanced phytoremediation of copper and cadmium-contaminated soil has been proven: For example, the Chinese invention patent with application number: 201710140099.9 discloses a method for combining ethylenediamine disuccinic acid and hagstone to repair cadmium-contaminated soil; for example, application number: 201410048591 .X’s Chinese invention patent discloses a method to improve the phytoremediation effect of copper-contaminated soil, but there are problems such as single polluting elements, unnaturally polluted soil, or small plant biomass

The current research is mainly based on single heavy metal pollution, and a single enhancer is used to improve the remediation of heavy metal contaminated soil by plants. Most chelating agents promote the accumulation of heavy metals in plants, but are toxic to plant growth.

However, there are few researches on how to promote plant growth and increase the uptake and transport of heavy metals by plants in complex polluted soils.

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