Bio-efficacy of sand mix application of pre-emergence herbicides alone and in sequence with imazethapyr on weed control in relay crop of blackgram
2010
Rao, A.S. (Acharya N.G. Ranga Agricultural Univ., Andhra Pradesh (India). Integrated Weed Management Unit) | Rao, G.S. (Acharya N.G. Ranga Agricultural Univ., Andhra Pradesh (India). Integrated Weed Management Unit) | Ratnam, M. (Acharya N.G. Ranga Agricultural Univ., Andhra Pradesh (India). Integrated Weed Management Unit)
A field experiment was conducted during winter seasons of 2007-08 and 2008-09 to study the bio-efficacy of sand mix application of pre emergence herbicides, pendimethalin 1000 g per ha, pretilachlor 500 g per ha, oxyfluorfen 120 g per ha, imazethapyr 63 g per ha alone and in sequence with post emergence application of imazethapyr 50 g per ha on weed control in black gram grown as relay crop. Results indicated that sequential treatments were found to be superior to individual applications. Among the sequential treatments, pre emergence sand mix application of pendimethalin 1000 g per ha followed by imazethapyr 50 g per ha at 20 days after sowing (DAS ) significantly reduced weed growth and recorded the highest seed yield (1113 kg per ha), net monetary returns (Rs.2255 per ha) and B:C ratio (1.33) and was at par with other sequential treatment, oxyfluorfen 120 g per ha followed by imazethapyr 50 g per ha and also with hand weeding at 15 and 30 DAS. Uncontrolled weed growth caused 61 percent reduction in seed yield of blackgram.
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