Influence of Gibberellic Acid and Naphthalene Acetic Acid on Fruit Retention, Yield and Quality Parameters of Aonla

An experiment was carried out in the Horticulture Garden of C. S. Azad University of Agriculture and Technology, Kanpur (U.P.) during 2023, using nine treatments viz., GA₃ at 20 and 50ppm, NAA at 15 and 30ppm along with their combinations including a control (water spray) on twenty-six years old plant of aonla cv. NA-7 replicated thrice in Randomized Block Design. From the experiment, it is reported that higher concentration of GA₃ @ 50 ppm + NAA @ 30 ppm significantly reduced fruit drop (18.84%) and increased fruit retention (81.16%). It also gave maximum fruit yield (211kg/plant), increased fruit length (3.74cm), fruit width (4.97cm), fruit weight (30.02g), fruit volume (27.79cc), specific gravity (1.08g/cc), pulp weight (28.68g) and maximum pulp: stone ratio (21.41). Plants treated with GA₃ @ 50ppm + NAA @ 30ppm also resulted in an increase in ascorbic acid (605.49mg/100g), TSS (12.15⁰Brix) and total sugar (9.81%) content. GA₃ @ 50ppm + NAA @ 30ppm significantly reduces the stone weight (1.34g) and acidity (1.72 %) under the plains of northern India.