Investigation the hazardous effects of compost on Lead (Pb) and Cadmium (Cd) accumulation in paddy soil during perennial application

In order to investigating the accumulation of cadmium (Cd) and lead (Pb) in rice cultivation because of long term application of compost, an experiment was conducted at rice-land as split plot arrangement based on randomized complete block design with three replications during 2006-2008. Main plots were compost with three treatments (0, 20 and 40 ton.ha-1) and sub plots were years of compost application in three levels (1, 2 and 3 years application). compost were applied before planting stage and soil samples were taken after harvesting of rice plants from 0-30 cm. The amount of total and available Cd and Pb were determined. The results indicated that using of compost and years of application and their interaction had significant effect on total and available Pb and Cd. According to results, the maximum amount of total Cd (2.29 mg.kg-1) and available Pb (4.891 mg.kg-1) where accumulated in three years application of 20 and 40 ton.ha-1 compost respectively. And maximum amount of total Pb, and available Cd, (41.73 and 0.106 mg.kg-1, respectively) were recorded when 40 ton compost.ha-1 applied. Meanwhile, with increasing the years of MSW application the content of Cd and Pb (total and available) in soil regularly and significantly increased.

کلیدواژه ها:

Cadmium ، Lead ، MSW ، Rice ، Soil