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Abstract: A study was undertaken to determine the oxidizable organic carbon mineralization rate of cowdung
(CD) and poultry manure (PM) alone and with combination of rice straw (RS) and lime under covered condition.
The oxidizable organic carbon mineralization rate followed the first order kinetics and was best in logarithmic
model of (Co-Ct) vs. t. The carbon mineralization rate was higher in the PM than CD. The application of rice
straw reduced mean mineralization rate of both CD and PM and it increased by liming. The cumulative carbon
dioxide evolution flux was higher in CD (854 mg kg-1) followed by CD + RS (828 mg kg-1) and CD + lime
treatments (780 mg kg-1). The carbon dioxide evolution rate was high up to 20 days in the CD and CD + lime
treatments and in the PM it was high up to 30 days. The cumulative carbon dioxide evolution rate was higher
in CD treatments than PM treatments. The mineralization rate became steady after 45 days in CD and 60 days
in PM treatment so within this period it is mature enough for field application. The addition of lime increased
half-life of cowdung and poultry manure. The lowest half- life (19 days) obtained from PM + lime treatment.