Vol. 9, Issue 11, Part A (2025)

Field experiment was conducted during summer season of 2024 to study the effect of different weed management practices on weed growth and productivity of rice fallow sunflower (Helianthus annuus L.) under zero tillage condition in randomized block design with nine treatments replicated thrice. The treatments were, Glufosinate ammonium spray before sowing fb one intercultivation at 30 DAS, Glufosinate ammonium spray before sowing fb Pendimethalin 1.0 kg/ha as PE fb Quizalofop ethyl 05 EC 50 g/ha at 20 DAS as PoE, Pendimethalin 1.0 kg/ha as PE fb one intercultivation at 30DAS, Pendimethalin 1.0 kg/ha as PE fb Quizalofop ethyl 05 EC 50 g/ha at 20 DAS as PoE, Pendimethalin 1.0 kg/ha fb Propaquizafop 62 g/ha at 20 DAS as PoE, Two intercultivations at 20 and 40 DAS, One intercultivation at 20DAS fb one hand weeding at 30 DAS and Weed free (Three hand weedings at 15, 30 and 45 DAS), Unweeded control. The results revealed that, weed free treatment recorded highest WCE (90.35%) maximum seed yield (1943 kg ha^-1), oil yield (761kg ha^-1), net return (Rs.71154 ha^-1). However, Glufosinate ammonium spray before sowing fb Pendimethalin 1.0 kg/ha as PE fb Quizalofop ethyl 05 EC 50 g/ha at 20 DAS as PoE as directed post emergence spray recorded the highest B:C ratio (2.12) and recommended as an effective weed management method in rice fallow sunflower under zero tillage in coastal Odisha.