Effect of Plant Growth Regulators on Quantitative Traits of Sapota Through Crop Regulation Under Hill Zone of Karnataka Kavyashree N., Naik B. Hemla, Tanuja Puli, Thippesha D Department of Fruit Science, College of Horticulture Mudigere, UAHS, Shivamogga Online published on 23 December, 2016. Abstract A field investigation was carried out during the year 2014–15 in the fruit orchard, Zonal Agricultural and Horticultural Research Station, Mudigere, Chikmagalur district of Karnataka, to study the “Effect of plant growth regulators on quantitative traits of sapota (Achras zapota L.) through crop regulation under hill zone of Karnataka”. The experiment was laid out in randomized block design with 10 treatments and 3 replications. Plant growth regulators like NAA (250, 300 and 350 ppm), 2, 4-D (40, 50 and 60 ppm) and Ethephon (350, 400 and 450 ppm) at varied concentrations were sprayed at pea nut stage. The results of the experiment showed that, foliar application of NAA at 350ppm gave significantly maximum fruit volume (106.87 ml), fruit length (6.07 cm), fruit diameter (58.30 mm), weight of fruit (110.23 g), yield per tree (108.47 kg) and yield per hectare (10.85 t) compared to all other treatments tried. The foliar application of Ethephon 450 ppm showed significantly decrease in number of mummified fruits (40.10) with maximum per cent of thinning (35.30%). Top Keywords sapota, growth regulators, Ethephon, yield, thinning, mummified fruits. Top |