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The investigation highlights results of a field ex p riment conducted in an Inceptisol in the Lower Gangetic Plain of India to evaluate the sole and interactive effect of different degree of puddl ing through various tillage implements and farm yard ma nure (FYM) on carbon and nitrogen transformation in the rice rhizosphere over two seasons. Three met hods of puddling viz., (1) Light puddling with coun try plough, (2) Moderate puddling with tractor drawn cu ltivator and (3) Intensive puddling with power till er, were employed in specified triplicate plots with an d without application of FYM and their effect on organic carbon, microbial biomass carbon, NH 4 -N, NO3 -N and total nitrogen in the rice rhizosphere soil were assessed. The results of this study revealed t hat while light puddling induced the highest build up of soil organic carbon, microbial biomass carbon and t otal nitrogen. Moderate puddling effectuated the highest level of NH4 -N and NO3 -N suggesting the highest rate of mineralization of organic-N in rice rhizosphere. Irrespective of puddling intensity, FY M escalated its positive effects. The highest level of NO3 N was induced through the rhizosphere during flow ering stage. All the chemical and biochemical attributes of the soil, except NO 3 – N, were stimulated to the greatest extent during t illering stage. From this research results moderate puddling could be su ggested for the best nitrogen availability during t he critical growth stages of rice.

INFLUENCE OF TILLAGE TECHNIQUES AND ORGANIC MATTER ON CARBON AND NITROGEN TRANSFORMATION IN THE RICE RHIZOSPHERE IN AN ALLUVIAL SOIL OF WEST BENGAL