Vol. 1 No. 1
Integrated weed management in onion. D. T. Bhutia, T. K. Maity And R. K. Ghosh
Author(s): D. T. BHUTIA, T. K. MAITY AND R. K. GHOSH
Abstract: A field experimelnt was conducted at \'C\' Block Farm, Kalyani of Bidhan Chandra Krishi Viswavidyalaya during December 2002 to April 2003 to study the effect of herbicides integrated with manual weeding on onion. The treatment combinations were weedy check/control, hand weeding at 25 and 45 DAT, weed free, Oxyfluorfen @ 100 g a.i./ha as POE at 25 DAT, Pendimethalin@ 750 g a.i./ha as PP at 2 DBT, Agil@ 100 g a.i./ha as PE at 2 DAT, Oxyfluorfen +
HW at 45 DAT. Agil + HW at 25 DAT and Oxyfluorfen + Agil. The most commonly noticed weeds were Ageratum conyzoides, Amaranthus viridis, Argemone mexicana, Portulaca oleracea, Euphorbia hirta, Physalis minima, Cyperus rotundus, Digitaria sanguinalis, Echinochloa crusgali, E. colonum, and Eleusine indica. The result revealed that integration of hand weeding at 45 DAT to initial Oxyfluorfen treatment significantly reduced weed population and biomass at harvest over thecontrol. The highest bulb yield was obtained with weed free treatment followed by Oxyfluorfen + HW at 45 DAT which was at par with twice HW at 25 & 45 DAT while the season long crop-weed competition (control) reduced the bulb yield by 38.26%. Integrated method was proved to be superior to other herbicidal treatments to increase bulb length, diameter, weight and yield. Preemergence application of Pendimethalin @ 750 a.l./ha was found to be the most effective treatment among sole herbicidal treatments.
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