Experiment was conducted to study the effect of metallic pollutants viz., Cobalt, Nickel and Lead on growth performance and biomass accumulation of Acacia mangium a multipurpose tree species. Growth performance studies revealed that the concentrations of Cobalt Chloride significantly affect the shoot and root length, leaf number, Collar diameter and nodulation of growing seedling and found to be decreased with increasing the concentrations of Cobalt chloride. The shoot and root length, leaf number, Collar diameter and nodulation of rhizobium were significantly affected by different concentrations of Nickel Chloride. Different concentrations of Lead Chloride significantly influenced the growth of shoot, root, number of leaves and nodulation and the highest growth performance for all the parameters was seen in control treatment but there was gradual decreased with increasing the concentration. In case of biomass accumulation studies, different levels of Cobalt chloride, Nickel Chloride and Lead chloride in soil showed statistically significant variation in leaves dry matter of above ground parts and below ground parts, total plant along with shoot / root ratio and found control was superior for maximum biomass accumulation.
Cobalt, Nickel, Lead, growth, biomass, Acacia mangium
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