Effects of Fertilization on Lead Uptake and Accumulation in Oenanthe stolonifera
Abstract: In order to study the effects of different fertilizations on the accumulation of lead (Pb) in Oenanthe stolonifera D.C., and to investigate the pollution sources of Pb in Oenanthe stolonifera and the pre-venting technologies, three sampling areas were selected in the production region. In the areas, the soils, irrigation water, fertilizers and Oenanthe stolonifera plants were sampled to test Pb concentrations. The results showed that Pb concentrations exceeded the maximum allowable concentrations (MAC, according to the Chinese Standards) in some Oenanthe stolonifera and irri-gation water samples in three areas, and in some soil samples in two areas. Pb accumulations in Oenanthe stolonifera samples were related highly to Pb concentrations of irrigation water samples, and somewhat with Pb concentrations of soil samples, but had no evident relation with Pb con-centrations of the fertilizers. Therefore, the Pb in irrigation water was the main source of Pb pol-lution in Oenanthe stolonifera, and the Pb in soils might be another pollution source. Application of the fertilizer diammonium phosphate reduced Pb concentration of Oenanthe stolonifera greatly, and had no significant influence on the yield of Oenanthe stolonifera. It can be concluded that Pb concentration in the irrigation water should be reduced, in the production of Oenanthe stolonifera, or the cleaner irrigation water ought to be selected. Diammonium phosphate is the suitable ferti-lizer.
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