Acceleration of Lead Phytostabilization by Maize (Zea mays) in Association with Gliricidiasepium Biomass

Abstract Soil where shooting practices are conducted is extremely contaminated with heavy metals, exclusively by Pb, due to the bullets and bullet fragments. These extreme concentrations of Pb, generate an unfavourable surroundings for agriculture and human health through phytoaccumulation. This study was conducted to assess the possibility of particular bio-amendment, phytostabilization on the reduction of bioavailable Pb in such contaminated soil. Biomass (BM) produced from Gliricidiasepium was used to see its ability to be used in soil remediation together with Maize (Zea mays) as phytostabilizer. A pot experiment was conducted with Maizeby adding BM at three different percentages, 1, 2.5 and 5% (w/w). Soil without amendments served as the control and arranged in a complete randomized design. By maize, translocation rate of heavy metals into crop were determined. After sixth week, grown maize were harvested and analyzed followed by digestion with con.HNO3. The most significant immobilization (p<0.05) was indicated by treatment 5% BM for Pb than control. Metal translocation towards plant decreased with increasing application rate of soil amendment,Gliricidia woody BM. Determination of Plant factor (PF) and Translocation factor (TF) indicates that PF>TF in maize. For the treatment 5% BM, PF and TF for Pb are 1.22 and 0.15 respectively. Thereby maize can be considered as a potential phytostabilizer. At the same time efficiency of phytostabilizing nature of maizecan increase together with the application of soil amendment – BM.

Keywords Amendment, Biomass, Immobilization, Phytostabilizer, Translocation factor.

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