Effect of integrated weed management in rainfed upland rice of Odisha

Abstract

A field experiment was conducted during wet seasons of three consecutive years, viz. 2013-15 under typical rainfed upland situation to evaluate the performance of different weed management techniques for improving the overall productivity and to work out the economics of different weed management practices in Vandana variety of rice. The highest grain yield (3.18 t ha-1) was observed in weed free condition where three hand weeding at 15, 30 and 45 DAS has been done followed by two hand weedings (2.97 t ha-1) at 15 and 35 DAS, which was at par with the stale seed bed + post emergence application of Azimsulfuron 35 g a.i. (2.86 t ha-1) with weed control efficiency (WCE) of 90.8 per cent. Yield reduction due to weed competition in weedy plot was 58% over weed free check. Use of Azimsulfuron at 35 g a.i. per ha at 20 DAS proved to be more cost effective over the other treatments (BC ratio 1.21). Thus, use of Azimsulfuron at 35 g a.i. per ha 20 DAS was found to be the most cost-effective practice in upland conditions simulating the conditions prevalent in the present study.