BIO- EFFICACY OF DIFFERENT HERBICIDES ON GROWTH AND PRODUCTIVITY OF ONION (ALLIUM CEPA L.)
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Date
2016
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Division of Vegetable Science and Floriculture, Sher-e-Kashmir University of Agricultural Sciences & Technology of Jammu
Abstract
The present investigation entitled “Bio- efficacy of different herbicides on growth and productivity of onion (Allium cepa L.)” variety N -53 was conducted during the year 2015-16 at vegetable research farm, FOA, SKUAST- J, Chatha. The experiment was laid out in Randomized block design with three replications and fourteen treatments.
The weed density, weed dry matter accumulation and weed control efficiency varied significantly with the stages of the crop. It showed a declining trend with highest at 60 days after transplanting and lowest at the time of harvesting, Considering the weed control strategies significantly lower weed density, weed dry matter accumulation, weed index and relatively higher weed control efficiency were recorded in weed free plots followed by treatment with pre-emergence application of oxyflurofen @ 0.15 kg/ha + 1HW @ 40-60 DAT which was at par with the pre-emergence application of oxyflurofen @ 0.15 kg/ha + post-emergence application of quizalofop-ethyl @ 0.05 kg/ha applied, at 40 DAT. Among the herbicidal treatments, the weed free plots produced plants with less neck thickness (1.03 cm), higher average bulb weight (84.10 g), bulb yield/plot (10375.03 g), total soluble solid (14.38 Brix) and sulphur content (9.78 µmoles pyruvate/g) followed by pre-emergence application of oxyflurofen @ 0.15 kg/ha + post-emergence application of quizalofop-ethyl @ 0.05 kg/ha applied 40 DAT. The phytotoxicity symptoms of herbicides on crop were negligible. From economics point, the weed free plots resulted in higher cost of cultivation and net returns but lower B: C ratio whereas in pre-emergence application of oxyflurofen @ 0.15 kg/ha + post-emergence application of quizalofop-ethyl @ 0.05 kg/ha applied 40 DAT showed highest B: C ratio.