Vol. 11, Issue 9 (2022)

Author(s):
Lokesha R, Athani SI, Gollagi SG, Sanjeevraddi G Reddy, Nadaf AM, Prasanna SM and Patil DR

Abstract:
The experiment was carried out at Horticultural Research and Extension Centre, Vijayapura, Tidagundi on 12 years old, healthy and vigorous and uniformly grown custard apple trees plant to assess the Effect of different plant growth regulators on flowering and fruit set of custard apple (Annona squamosa L.) cv. Balanagar. The experiment was laid out in randomized block design with seven treatments and three replications. Different treatments were GA3 at 50 and 100 ppm, NAA at 100 and 200 ppm and Brassinosteroid at 0.5 and 1 ppm, theses plant growth regulators were sprayed at 3 stages like before flowering, during flowering and after fruit set. The experiment was conducted in two season 2021 and 2022 in January to June. Among the different plant growth regulators sprayed treatment NAA 200 ppm recorded Minimum (22.33) days required for initiation of flowering, minimum (30.42 and 106.92) days required from flowering to fruit set and flowering to maturity, respectively. Maximum 26.17, 38.92 and 122.00 days required for initiation of flowering, days required from flowering to fruit set and flowering to maturity, respectively was recorded in control treatment. Similarly, the maximum number of flowers per shoot (63.14) and per plant (757.22) and pollen viability were recorded in NAA 200 ppm. More number of fruits per plant (83.75) and higher fruit set (13.03%) were recorded in NAA 200 ppm. Whereas, minimum flowers per shoot (43.72), per plant (523.81), pollen viability (50.65%), number of fruits per plant (47.25) and fruit set (9.18%) were recorded in control treatment (water spray).