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Evaluation of digested sludge as an amendment to chromium and lead contaminated Gangetic alluvial soils of India

Indian Agricultural Research Journals

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Title Evaluation of digested sludge as an amendment to chromium and lead contaminated Gangetic alluvial soils of India
 
Creator BHAT, MOHAMMAD AUYOUB
AGARWAL, H P
 
Subject Amendment, Cr, Digested sludge, Pb, Phytotoxicity
 
Description Indo-Gangetic belt of India possesses many industrial sites whereby effluents containing very high levels of heavymetals, especially Cr and Pb are directly discharged into the environment without any treatment or cleaning processleading to soil, plant and ecological toxicities. There has been increasing interest amongst scientific community to remediatethe contaminated soils with cost-effective and environmentally safe methods. Keeping this in view, pot experiments wereconducted to evaluate the effect of different levels of digested sludge addition to Gangetic alluvium, spiked with Cr or Pbup to 500 mg/kg on phytoxicity in corn (Zea mays L.) and radish (Raphanus sativus L.) plants. Increasing sludge levelsresulted in decreased levels of DTPA-extractable Cr and Pb in the soil. The recovery of these metals by DTPA declinedconsiderably with the duration following treatment application. Lowest biomass yield of test plants was observed in thetreatment where no sludge was applied. Increasing levels of digested sludge enhanced the dry matter yields and decreasedthe tissue concentrations of Cr and Pb in plants. Plant tissue metal concentrations across all treatments decreased fromfirst to second crop which could be ascribed to decrease in their DTPA-extractable levels in soil, a result of reversion ofthe metals into less available form with time. The findings reveal that digested sludge has a potential to reduce thephytoxicity of Cr and Pb and, therefore, can be used as an amendment for soils which have been adversely polluted withthese metals by anthropogenic and industrial activities.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2013-02-11
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/27217
 
Source The Indian Journal of Agricultural Sciences; Vol 83, No 1 (2013)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/27217/12379
 
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