Organic Waste Amendments Effect on Pb Uptake by Sunflower from Highly Pb-Contaminated Soil

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Tipa Panis
Suppakiet Sripanomtanakorn


A pot experiment was conducted to study the effects of three organic waste types (i.e., cow manure, sewage sludge and municipal solid waste compost) on Lead (Pb) uptake by sunflower (Helianthus annuus L.) from highly Pb-contaminated soil. The organic wastes were applied to the soil at the rates of 100-3,000 kg N/ha in the presence of EDTA at 5 mmol/kg. The results indicated that the application of the organic wastes, especially of the cow manure, led to plant growth and biomass increment. The concentration of Pb in roots, leaves, and stems of sunflower significantly decreased when the organic waste were applied. The Pb concentration of sunflower ranged from 2,218 to 3,382 mg/kg, 622 to 3,055 mg/kg and 382 to 959 mg/kg in roots, leaves, and stems, respectively. For a comparison of the three plant parts, leaves accounted for the majority for the Pb uptake and accumulation. Sequential fractionations of the soil after harvesting indicated that addition of these organic wastes can redistribute Pb in the soil from more to less mobile fractions.

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