Study of Important Microbial Populations and Organic Carbon in Relation to Soil pH in Some Rice Growing Soils of Manipur

Research Journal of Agricultural Sciences 03/2012; 3(1):159-162.


The study of microbiological population was undertaken with the collection of fifteen soils samples from three blocks viz Haorang, Wangoi and Sawombung in some rice cultivated soils of Manipur (pH 4.96 to 6.37). The oxidizable organic carbon of these soils was found to be fairly good and ranged from 6.00 to 18.1g kg-1. The correlation between the pH values and the oxidizable organic carbon contents of these soils exhibit a significant negative correlation (r = -0.654**). The regression equation between the oxidizable organic carbon and pH of the soil indicated that, the attainable pH was 6.12 and drop by 0.0683 for every unit increase in pH. The Colony Forming Unit (CFU) of total viable bacteria (105) g-1 soil, actinomycetes (104) g-1 soil and fungi (103) g-1 soil were found to vary from 98 to 192, 70 to 161 and 54 to 99, respectively. The pH of the soil was found to be positively correlated with CFU of total viable bacteria (r = 0.376*). Correlation coefficient between pH and CFU actinomycetes were significantly correlated (r = 0.462**). The pH of the soil was found to be negatively correlated with CFU fungi (r = -0.413**). The cyanobacteria population in all the soil was found to be much less and their colonies and were unable to count even at 102 dilutions.

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