Effect of preharvest application of chemicals and plant growth regulators on physical parameters and shelf-life of custard apple (Annona squamosa L.)

Abstract

The three varieties of custard apple were subjected to various preharvest chemicals and plant growth regulators treatments, viz., CaCl 2 @ 2%, KNO 3 @ 2%, GA 3 @ 50 mg/l, NAA @ 50 mg/l and no spray. Then mature, uniformed sizes fruit were harvested and observation were recorded under ambient storage condition. Balanagar recorded maximum fruit weight (180.32 g), volume (109.42 cc) and pulp weight per fruit (90.52 g) while minimum peel weight per fruit (53.87 g) and seed weight per fruit (10.43 g) recorded in Local variety at harvest. GA 3 @ 50 mg/l were found to best since they have maximum fruit weight (159.60 g), volume (96.85 cc) and pulp weight per fruit (79.54 g) at harvest. In case of fruit diameter (7.39 cm, 7.09 cm) in both factors were recorded maximum at 3 rd day of storage. CaCl 2 @ 2% recorded minimum PLW (23.54% at 6 th day) and spoilage percentage (32.22%) and maximum fruit firmness (0.25 kg/cm 2 at 6 th day), shelf-life of fruits (7.25 days) and marketable fruit percentage (67.78%) during storage. Thus, it can be inferred from the study that Balanagar variety and GA 3 @ 50 mg/l rated as most acceptable and superior, over all the other treatments in term of physical parameters and in term of quality and shelf-life CaCl 2 @ 2% treatment observed during ambient storage.