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|Advisor:||S. I. Halikatti|
|Title:||sequential application of herbicides for weed management in drill sown and transplanted onion (allium cepa l.)|
|Abstract:||Two field experiments were conducted at Regional Horticultural Research and Extension Centre, UHS, Bagalkot during kharif season of 2011 and 2012 to study the “Sequential application of herbicides for weed management in drill sown and transplanted onion”. Herbicides viz., pendimethalin, butachlor and oxyfluorfen were used as pre emergence while pendimethalin, butachlor, oxyfluorfen, fenoxaprop-p-ethyl and propaquizafop were used as post emergence. The experiments were laid out in randomized block design with three replications. In drill sown onion, at 14 DAS pre emergence application of butachlor @ 1.0 kg ha-1 was moderately toxic (5.67) to onion while oxyfluorfen @ 0.08 kg ha-1 was slightly toxic (2.17). All the herbicides significantly reduced the number and dry weight of weeds over unweeded check. Weed free check recorded significantly lower dry weight of weeds. Among the herbicides, at harvest sequential application of oxyfluorfen @ 0.08 kg ha-1 followed by (fb) oxyfluorfen @ 0.25 kg ha-1, was quite efficient in controlling weeds which reflected through decreased weed dry weight (6.49 g 0.5 m- 2), increased weed control index (80.44%) and lower weed index (13.43%) . It also recorded significantly higher bulb yield (23.02 t ha-1) than all other treatments except weed free check (26.80 t ha-1) with higher net returns and B:C (Rs. 1,10,850 ha-1 and 4.95 respectively). In transplanted onion, at 14 DAT slight toxicity was noticed in pre emergence spray of butachlor @ 1.00 kg ha-1 (2.33) and oxyfluorfen @ 0.25 kg ha-1 (3.00) while toxicity was not observed in pendimethalin @ 1.00 kg ha-1. Weed free check significantly reduced the dry weight of weeds. Among the herbicides, at harvest sequential application of oxyfluorfen @ 0.25 kg ha-1 fb oxyfluorfen @ 0.25 kg ha-1 was more effective due to higher weed control index (93.49%), reduced the weed dry weight (4.22 g 0.5 m-2) and weed index (12.67%). This treatment also produced significantly higher growth, yield attributes and bulb yield (19.93 t ha-1) with maximum net returns (Rs. 87,163 ha-1) and benefit cost ratio (3.50). Both in drill sown and transplanted onion, sequential application of oxyfluorfen fb oxyfluorfen recorded higher TSS (%), lower physiological loss of bulb weight (%), bulb spouting (%) and bulb rotting (%).|
|Theme:||sequential application of herbicides for weed management in drill sown and transplanted onion (allium cepa l.)|
|Appears in Collections:||Thesis|
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