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sequential application of herbicides for weed management in drill sown and transplanted onion (allium cepa l.)

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Title sequential application of herbicides for weed management in drill sown and transplanted onion (allium cepa l.)
 
Creator Kantesh Gandolkar
 
Contributor S. I. Halikatti
 
Subject null
 
Description 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 (%).
 
Date 2017-03-06T20:45:56Z
2017-03-06T20:45:56Z
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/5810004262
 
Language en
 
Format application/pdf
 
Publisher UASD