EFFECT OF GROWTH PROMOTERS AND MICRONUTRIENTS ON GROWTH AND BULB YIELD OF ONION (Allium cepa L.) UNDER HILL ZONE OF KARNATAKA
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Date
2022-09-10
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College of Horticulture, Mudigere, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shivamogga
Abstract
A field experiment was conducted at College of Horticulture, Mudigere during the year 2021-22 to investigate the effect of growth promoters and micronutrients on growth and bulb yield of onion (Allium cepa L.) under hill zone of Karnataka. The study consists of eleven treatments with three replications laid out in Randomised Complete Block Design (RCBD). The treatments include different plant growth promoters viz., GA3 and NAA each at 75 ppm, 100 ppm, 125 ppm and different micronutrients viz., ZnSO4 and Boron each at 0.25 per cent and 0.50 per cent. Results showed that foliar application of GA3 @ 125 ppm recorded significantly maximum plant height and leaf length. The foliar application of GA3 @ 100 ppm exhibited significantly maximum number of leaves, leaf girth, total chlorophyll content, collar thickness, days taken for maturity (125 days), bulb yield (6.21 kg/plot and 34.50 t/ha), marketable bulb yield (33.30 t/ha), A grade bulb yield (53.81 % and 18.56 t/ha), polar diameter, equatorial diameter, bulb volume, reducing sugar, TSS content (12.83°B), dry matter (13.80%), net returns (₹ 3,69,514) with benefit cost ratio (2.11) and minimum non-marketable bulb yield (1.20 t/ha), C grade bulb yield, neck thickness (0.93 cm), moisture content and physiological loss in weight (8.35 %). The treatment of NAA @ 100 ppm observed significantly maximum B grade bulb yield, total sugars and minimum number of double bulbs. Hence, the study concluded that foliar application of GA3 @ 100 ppm found to be suitable for obtaining maximum yield and good quality bulbs in onion under hill zone of Karnataka.