Author(s): RUHIDAS GHATAK, R.K. GHOSH AND SUBRATA KUMAR GHOSH

Abstract: field experiment carried out during summer\' 2000 and 2001 at Kalyani \'C\' block farm, Bidhan Chandra Krishi Viswavidyalaya, West Bengal in new alluvial soil to evaluate the impact of IWM on soil micro flora in sesame resulted ligher population and vigorous growth of weeds in weedy check plots which reflected the maximum dry weight of weeds md lower yield of sesame. The dominant weed species in the experimental field were Cynodon dactylon, Echinoch/oa ;olona, Digilaria sanguinalis, Cyperus rotundus, Digera arvens and Physalis minima. Hand weeding alone or in ;ombination with herbicide controlled the weeds successfully. Net return increased with increasing levels of irrigation jue to the higher seed yield. Fluchloralin application alone as pre-emergence or in combination with hand weeding at 35 DAS resulted an initial decrease in population at 3 DAA due to toxic effect of the chemical which gradually recovered at 30 DAA. The interaction of three irrigations with weedy check recorded the maximum number of both beneficial nonsymbiotic N-fixing bacteria and P-solubilising bacteria at 3 DAA than that of the other treatment combination.

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