MICROBIAL ACTIVITIES IN SOIL

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Abstract
The activity and functions of bacteria, Actinomyces, fungi, Azotobacter, and cellulose decomposing bacteria in the transformation of organic residue in the soil were ascertained by periodic determinations of numbers of organisms, C02 evolution, and various organic complexes. Considerable lag occurred between the maximum C02 production and max. numbers of organisms, during which time a sequence of activity of different groups of microbes was manifested, the bacteria taking the lead, followed closely by Actinomyces and fungi. Bacteria seemed to be largely responsible for the rapid decomposition of the water-soluble constituents, and fungi, bacteria and actinomycetes jointly, for the hemicellulose and cellulose compounds. The % of protein and lignin substances increased as decomposition proceeded.

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