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Nitrogen transformation in sewage-sludge amended soil as influenced by addition of zinc,cadmium and nickel

Indian Agricultural Research Journals

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Title Nitrogen transformation in sewage-sludge amended soil as influenced by addition of zinc,cadmium and nickel
 
Creator SINGHA, D D
SINGH, ANOOP
GUPTA, A P
 
Subject sewage-sludge, sludge-amended soil, heavy metal, multi-metal, nitrification, ammonification, incubation
 
Description      An incubation experiment was conducted to study the effect of Zn, Cd and Ni alone and in combination on the Ntransronnation in loamy-sand soil amended with sewage-sludge. Nitrification decreased significantly at Zn, Cd and Niconcentration >1.5,>=0.25 and >=1.5 meq/kg, respectively at the end of 16 weeks incubation. However, the decreasewas more marked during later period of incubation. Ammonification was affected at much higher rates of metal addition.The threshold metal concetration for 5% decrease in the total mineralized N was 6 (196.1 ppm), 0.25 (14.1 ppm)and 6 (176.1 ppm) meq/kg Zn, Cd and Ni, respectively. The efTect of Zn and Ni on the N transformation was comparable,whereas Cd was 6-8 and 4-6 times more inhibiting than Zn and Ni. Addition of metals combinedly caused severereduction in the nitrification and ammonification. The effect was additive on the nitrification up to 6, 1 and 6 meq/kgZn, Cd and Ni. respectively when used in combination. Further increase in the metal concentration resulted in morethan addilive inhibitory effect except the 9, 1.5 and 9 meq/kg Zn, Cd and Ni, respectively showing less than additiveeffect when combinedly added. Addition of metals combinedly caused 9.5-86.1 and 14-44.2% decrease in the nitrificationand ammonification, respectively after 16 weeks of incubation.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2013-02-13
 
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/27317
 
Source The Indian Journal of Agricultural Sciences; Vol 68, No 2 (1998)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/27317/12431
 
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