Vol. 12, Issue 3 (2023)

Author(s):
SS Das, A Mohapatra and BK Mohapatra

Abstract:
A field experiment was conducted during summer 2022 at Bhubaneswar to study the effect of integrated weed management in sunflower under lowland paddy- fallow situation in randomized block design with eight treatments replicated thrice. The treatments are: T₁-Paraquat spray before sowing +one intercultivation at 35 DAS T₂-Paraquat spray before sowing + pendimethalin @ 1.0 kg ha^-1 as pre emergence + Quizalofop ethyl @ 37.5 g ha^-1 at 20 DAS as post emergence spray, T₃- Pendimethalin@ 1.0 kg ha^-1 as pre emergence + one intercultivation at 30DAS, T₄-Pendimethalin @1.0 kg ha^-1 as pre emergence +Quizalofop ethyl @ 37.5 g ha^-1 at 20 DAS as post emergence spray, T₅-2 intercultivation at 20 and 40 DAS, T₆- One intercultivation at 20DAS+ one hand weeding at 30 DAS,T₇- Weed free (Three HW at 15, 30 and 45 DAS) and T₈-Unweeded control. The test hybrid “DRSH-1” was sown on 30.01.2022 and harvested on 02.05.2022. The soil was sandy loam in texture, with pH-6.08, low organic carbon (0.59%), medium available nitrogen (118 kg ha^-1), low available phosphorus (7.6 kg ha^-1) and low available potassium status (262.3 kg ha^-1). The results revealed that, weed free treatment (T₇) recorded maximum seed yield (2158.89 kg ha^-1), stover yield (4315.00 kg ha^-1), HI (32.44%), and oil yield (751.72 kg ha^-1) which was at par with T₅, having seed yield (2036.67 kg ha^-1), stover yield (4224.00kg ha^-1), HI (32.52%) and oil yield (784.66 kg ha^-1). Similarly weed free treatment recorded highest gross return (Rs.129844.00/ha) and highest net return (Rs.81134.00/ha). However, Paraquat spray before sowing + pendimethalin@1.0 kg ha^-1 as pre emergence + Quizalofop ethyl @37.5g ha^-1 at 20 DAS as post emergence spray recorded the highest B:C ratio (1.96) and recommended as an effective method of integrated weed management in sunflower under low land paddy-fallow situation in coastal Odisha.