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Title

ENHANCED CLEAN-UP OF LEAD-CONTAMINATED ALLUVIAL SOIL THROUGH CHRYSANTHEMUM INDICUM L.

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Abstract

 The natural potential of CHRYSANTHEMUM INDICUM L. for the clean-up of L.ad-contaminated soil was investigated under pot experiment. Maximum applied L.ad (at 50 mg/kg) caused significant reduction in the plant height (31.71 %), root L.ngth (31.15 %) and dry biomass (32.71 and 41.25 % for root and shoot, respectively); however, minimum applied L.ad (at 10 mg/kg) promoted the growth of plants to some extent, over the respective control pots. L.ad concentration in the tissues followed the order as root>shoot>flower. The combinatorial treatment T 16 (50 mg/kg Pb, 0.8 g/kg elemental sulphur and 6 g/kg vermicompost) caused maximum concentration of L.ad in root, shoot and flower up to the extent of 43.58, 22.45 and 9.62 mg/kg, respectively, L.ading to the maximum bioaccumulation factor (0.38). However, the combinatorial treatment T 4 (sulphur and vermicompost) showed maximum translocation factor (0.63) and T 12 (20 mg/kg L.ad, 0.8 g/kg elemental sulphur and 6 g/kg vermicompost) produced maximum remediation ratio (0.153). The combinatorial treatments under L.ad-contaminated (10-50 mg/kg) soils showed higher REMEDIATION EFFICIENCY indicating enhanced clean-up of the aforesaid soils through C. indicum L. Applied L.ad (>20 mg/kg) altered the chlorophyll-a, chlorophyll-b and carotenoid contents of the plants. Hence, the authors conclude that a non-edible ornamental plant, C. indicum L., is preferred to be safely grown in moderately L.ad-contaminated soils along with application of elemental SULPHUR AND VERMICOMPOST, which will boost the PHOTOSYNTHETIC PIGMENTS of the plants, L.ading to enhanced clean-up of the L.ad-contaminated soil.

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