School Of Environment And Earth Sciences

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Author: search.filters.author.Garg, V.K.Subject: search.filters.subject.Heavy Metals

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    Vermi-modification of ruminant excreta using Eisenia fetida
    (Springer Verlag, 2017) Sharma, K.; Garg, V.K.
    Present investigation aims on the vermicomposting of the excreta of different ruminants to convert it into manure employing earthworm species, Eisenia fetida. A total of 11 feedstocks (FS1?FS11) with different ratios were prepared from the excreta of different ruminants, viz., sheep, cow, buffalo, and goat. Semi-composted feedstocks were fed to E. fetida for 90?days under laboratory conditions. Vermicomposting enhanced the nutrient contents of ruminant excreta and converted it into odor-free and homogenous vermicompost. The growth of E. fetida was significant in all the feedstocks, but largest biomass gain was achieved in buffalo excreta followed by [sheep?+?buffalo]?>?[goat?+?buffalo] and [cow?+?buffalo] feedstocks. Highest fecundity (782???23.3) was also recorded in buffalo excreta followed by [goat?+?buffalo] excreta feedstock (484.6???15.7). In vermicomposted feedstocks, total organic carbon and organic matter was lesser, while NPK and heavy metals were higher as compared to raw feedstocks. C/N ratios of vermicomposts ranged from 15.37 to 38.56, which indicate a good level of maturity and stabilization of feedstocks. ? 2017, Springer-Verlag GmbH Germany.
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    Assessment of bio-concentration factor of heavy metals in Indian soil-crop system
    (Scientific Publishers, 2017) Yadav, P.; Garg, V.K.; Singh, B.; Mor, S.
    Bioaccumulation of heavy metals in different agricultural products in soil-crop systems has fascinated pervasive attention in yester years due to food safety issues. The objectives of this study were to determine the influence of different soil parameters on bio-concentration of heavy metals? from soil to pearl millet grains. For the purpose, heavy metals were quantified in pearl millet grains and corresponding fields? rhizospheric soil samples from different study sites in Haryana, India. The mean concentrations of Cd, Pb, Ni, Zn, Fe and Cu in pearl miller garins were found to be 0.50, 6.74, 3.86, 49.72, 142.0 and 10.17 mg kg?1 respectively. Pearl millet showed capacity to transfer essential metals Zn and Cu from soil to grains while showed a restricting effect to the uptake of Co and Cr. Further multivariate statistical techniques like correlation analysis, principal component analysis and cluster analysis were applied to the data for supplementary and qualitative evaluation of inter-dependences among the studied parameters. Bio-concentration factors of all the studied heavy metals in pearl millet grains showed significant negative correlations with their respective soils? total metal concentrations. The results revealed lesser metal uptake with increasing soil total metal concentrations. Inspite of the variability in the characteristic of investigated soils, significant correlations among soil quality parameters and metal accumulation in grains were recorded. Cluster analysis revealed formation of many primary cluster pairs such as EC-Na, CEC-Ca, BCFNi-Cus, BCFFe-TOC, BCFzn-EC, BCFPb-pH, BCFCu-Na and CdS-Pbs etc. ? 2017, Scientific Publishers. All rights reserved.