PJB-1980-13
Effect of salinity on 14C-labelled microbial biomass and its contributiob to soil organic matter
M.A. MALIK AND F.
AZAM
Abstract
Estimation of soil microbial biomass
using fumigation technique revealed a decrease in its content with increase in soil salinity and the microbial biomass was found to be directly proportional to the CO2 evolution from soil. Biomass was estimated to be 4-5 % of the residual organic carbon . 14C component derived from labeled plant material ranged from 31-63% of the total biomass; maximum being in normal soil and minimum in saline-sodic soil. The results of organic matter fractionation revealed a higher 14C activity in fulvic and humic acid extracted from fumigated than that extracted from untreated soil. This differences has been taken as an evidence of direct contributiob of microbial biomass to humic compounds.
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