SEASONAL CHANGES IN MICROBIAL BIOMASS AND ENZYME ACTIVITIES IN SOME SOILS OF WESTERN INDIAS.A. MATT AND S.M. PANDYA
Seasonal variation in microbial biomass-carbon and nitrogen and soil enzyme activities (urease and amidase) were measured in soils of different parts of Rajasthan, Gujarat, West Uttar Pradesh, and Madhya Pradesh in Western India. Considering the eco-climate conditions, lithology and soil types, the entire study area was divided into five zones, viz, arid to semi-arid, semi-arid and arid-sandy, arid-saline and dry sub-humid zone comprising a total of eleven sites. Maximum biomass-carbon (596 pg g-' soil) and nitrogen (25.44 jig g-1 soil) were recorded in dry sub-humid zone during summer season. While minimum values (7.9 jig g-' soil and 1.76 pg g-1 soil) were recorded respectively in arid-sandy zone during monsoon or post monsoon season. The activities of soil urease and amidase were recorded higher during the monsoon season while in the arid-sandy zone no enzyme activities could be recorded.
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