Impact of foliar application of NAA, boron and zinc on fruit drop, yield and quality attributes on aonla (Emblica officinalis Gaertn.) cv. NA-7

In order to assess the impact of foliar application of NAA, boron and zinc on fruit drop, yield, and quality attributes of anola, twenty one years old plants of cv. NA-7 were used, which was treated with NAA @ 25, 50 and 75ppm, Borax @ 0.2%, 0.4% and 0.6%, and zinc sulphate @ 0.3%, 0.6% and 0.9% including a control (water spray), replicated thrice in Randomized Block Design in the Garden, Department of Fruit Science, C.S. Azad University of Agriculture and Technology, Kanpur (U.P.) during the year 2022-23. From the experiment it is observed that the higher concentration of NAA @ 75 ppm significantly increases fruit retention (34.02%), fruit yield (85.89 kg) per tree, fruit length (4.34cm), fruit width (4.94cm), fruit weight (37.83g), fruit volume (35.97cc), specific gravity (1.18 g/cm³), pulp weight (36.27g) and reduced fruit drop (65.94%), whereas, maximum pulp: stone ratio (25.29%), fruit moisture (94.05%) and minimum titratable acidity (1.64%) content were obtained with the spraying of zinc sulphate @ 0.9%. Spraying of Borax @ 0.6% reduces fruit stone weight (1.31g) and increases ascorbic acid content (615.25mg per 100g pulp) along with an increases in TSS (15.12 °Brix) and total sugars (12.93%) content in anola fruits under North Indian plain.