"WEED MANAGEMENT STUDIES IN RABI ONION (Allium cepa L.) cv. N-2-4-1".

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Date
2014
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The present investigation entitled “ Weed management studies in rabi onion (Allium cepa L.) cv. N-2-4-1.” was carried out at onion storage scheme, MPKV, Rahuri during rabi 2012. The experiment was laid out in randomized block design with three replications. Onion was grown on flat beds. The different herbicides viz., Oxyfluorfen 23.5 % EC, Pendamethalin 30% EC, Quizolfob ethyl 5 % EC and Fenoxaprop-p-ethyl 10 % EC were used to control weeds. The farm yard manure @ 20 t ha-1 was applied before preparing the layout and flat beds. Pre-emergence herbicides were sprayed 3 to 4 days after transplanting of onion seedlings and post- emergence herbicides were sprayed 25 DAT. Fertilizers 50 kg N, 50 kg P2O5 and 50 K2O kg ha-1 was applied as a basal dose and 50 kg N was applied as top dress dose one month after transplanting to all the treatments. The experiment revealed that the growth attributes viz., plant height (26.22, 58.89 and 69.63 cm at 30, 60 and 90 DAT respectively) and number of leaves per plant (6.66, 12.91 and 13.67 at 30, 60 and 90 DAT respectively) were significantly higher in the treatment T11- hand weeding at 15, 30 and 45 DAT. It was followed by chemical weed control treatment T7- Oxyfluorfen 23.5 % EC @ 0.088 kg a.i/ha + Quizolfop ethyl 5 % EC @ 0.025 kg a.i/ha POE + hand weeding 45 DAT recorded plant height (26.08 cm, 58.36 cm and 69.61 cm at 30, 60 and 90 DAT, respectively) and number of leaves (6.22, 12.17 and 12.94 at 30, 60 and 90 DAT, respectively). The treatment T11- hand weeding recorded highest yield contributing characters viz., average bulb weight (92.06 g), polar diameter (5.22 cm), equatorial diameter (5.98 cm) and ‘A’ grade bulbs (64.63 %) which was followed by treatment T7- Oxyfluorfen 23.5 % EC @ 0.088 kg a.i/ha + Quizolfop ethyl 5 % EC @ 0.025 kg a.i/ha POE + hand weeding 45 DAT i.e. average bulb weight (89.17 g), polar diameter (5.17 cm), equatorial diameter (5.87 cm) and ‘A’ grade bulbs (61.49 %). Where, the treatment T12- weedy check recorded the lowest growth and yield contributing characters as compared to other treatments due to less vegetative growth and poor bulb development owing to weed infestation.
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