Author(s): P. BANERJEE, D. MAITI AND P. BANDYOPADHYAY

Abstract: A field experiment was conducted during the boro season of2002-03 and 2003-04 on sandy clay loam soils oflnstructional farm, B.C.K. V., Jaguli, Nadia, W.B. to study the effect of irrigation and different weed management practices on weed growth, yeild potential, CU, WUE and finally economics of Hybrid rice. The experiment was laid out in split plot design with 4 levc:ls of irrigation as main plots and 5 weed control treatments as subplots and reeplicated thrice. The hybrid cul ti var ProAgro 6444 was used. Continuous submergence of 5+2 cm depth of water considerably redeced the weed-crop competition and increased the grain yeild and decreased the dry matter production of total weeds over 3 days after disappearance of ponded water. Crop under continuous submergence along with unweeded control consumed maximum water use (153 cm) whereas, irrigation 3 days after disappearance of ponded water along with weed free cheek (fort night interval) gave the maximum water use efficiency ( 16.31 kg/ha/mm), it must be due to lowest wateruse with comparatively higher yeild of rice under this treatment. Whereas, herbicide treatment of Pyrazosulfuron Ethyl along with continuous submergence recorded maximum benefit: cost ratio of 1.94:1.

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