Effect of different organic materials on maize at different concentrations of lead.

The present study has been undertaken to know the effect of concentrations of lead (Pb) and different organic materials on the maize yield, concentrations of lead on maize plants and diethylene triamine penta-acetic acid (DTPA) extractable lead (Pb) on the post harvested soils. The results revealed that growth of maize increased by adding lead (Pb) upto 25 mg kg(-1) soil and thereafter the growth decreased. Application of organic matter increased the growth of maize in Pb-contaminated soil. With the increase in Pb concentration in soil, the concentration of Pb in plants also increased, however, application of organic material decreased Pb concentration in maize. The concentration of DTPA extractable lead (Pb) in post harvested soil samples significantly and consistently increased with increase in Pb. The addition of organic manure decreased the DTPA extractable Pb in soil which might be due to complexation/chelation of Pb with organic matter.