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EFFECT OF COMPOUND POLLUTION OF HEAVY METALS ON CROPS IN CALCAREOUS SOIL

Lao Haumei (Guangxi Agricultural University, Nanning. 530005)Wang Hongkong (Beijing Agricultural University, Beijing, 100094)  
In this paper, pot experiment is conducted, to study copper, nickel, lead and zinc compound effect on phytotoxicity, growth, development, and accumulation of rice and soybean grown in calcareous soil. Ionic impulsion on indicating the effect of compound pollution and controlling soil heavy metal pollution is recommended.The results show that the coexisting elements have a synergism effect on rice, with a toxicity order: CuZnNiPb, and have an antagonism effect on soybean with a toxicity order: Cu PbZnNi. Copper, lead and zinc reduce the toxicity of nickel. Tissue accumulation and distribution of heavy metals in crops depend on the dose applied and interaction of elements.Generally, the higher the soil ionic impulsion results the higher crop ionic impulsion. It is much significantly for ionic impulsion when the concentration of each element is expressed by its available amount and the soil ionic impulsion at which the crop yield is reduced 10 percent 2.21 mmol/l
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