POST-HARVEST STUDIES IN CUSTARD APPLE (Annona squamosa L.) cv. BALANAGAR
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Date
2018-06-27
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College of Horticulture, Rajendranagar, HYD-30
Abstract
A set of three experiments were conducted in the PG Laboratory, College of Horticulture, Rajendranagar, Hyderabad to study the effect of gamma irradiation and various post-harvest treatments on shelf life and quality of custard apple cv. Balanagar by exposing the fruits to irradiation at different doses and treating the fruits with different post-harvest treatments at ambient temperature conditions.
The experiment-I consists of six irradiation treatments viz., T1-0.2 kGy, T2-0.4 kGy, T3-0.6 kGy, T4-0.8 kGy, T5-Hot water treatment, T6-control and was replicated 4 times under Completely Randomized Design. Among the irradiation treatments, fruits treated at T2-0.40 kGy recorded lower physiological loss in weight (4.17 %), spoilage (21.38 %), ripening (25.83 %), brix: acid ratio (73.30), total soluble solids (23.13° B), reducing sugars (12.55%), total sugars (13.92 % ) and higher firmness (2.94 Kg/cm2), acidity (0.34%), ascorbic acid (44.50 mg/100g). Highest shelf life (6.00) was recorded in fruits treated with T2 - 0.4 kGy and was followed by T3- 0.6 kGy (5.66) over control (4.00) with less browning (1.61 score). Similarly highest organoleptic score (8.36) was obtained in fruits treated with T2-0.4 kGy followed by T3-0.6 kGy (8.22).
The experiment-II consist of thirteen post harvest treatments viz., T1-Calcium nitrate @ 4 %, T2-Calcium nitrate @ 6 % , T3-Potassium permanganate @ 1 %, T4-Potassium permanganate @ 2 %, T5-Ascorbic acid @ 500 ppm, T6-Ascorbic acid @ 1000 ppm, T7-GA3 @ 50 ppm, T8-GA3 @ 100 ppm, T9-Benzyl adenine @ 50 ppm, T10-Benzyl adenine @ 100 ppm, T11-Salicylic acid @ 50 ppm, T12 - Salicylic acid @ 100 ppm and T13-control were replicated thrice in the CRD design. Among the post-harvest treatments, T7-GA3 @ 50 ppm recorded lower physiological loss in weight (3.48%), spoilage (33.05%), ripening (47.33%), brix : acid ratio (60.40), total soluble solids (23.04°B), reducing sugars (11.26 %), total sugars (12.83 %) and higher acidity (0.40%), firmness (2.82 Kg/cm2), ascorbic acid (46.66 mg/100g). Highest shelf life (8.33) was recorded in fruits treated with T7- GA3 @ 50 ppm followed by T8-GA3 @ 100 ppm (8.00)
over control (4.66). Similarly highest organoleptic score (8.47) was obtained in fruits treated with T7-GA3 @ 50 ppm followed by T8-GA3 @ 100 ppm (8.27).
The experiment-III consists of T1-1st best of experiment-I + 1st best of experiment-II, T2-1st best of experiment-I + 2nd best of experiment-II, T3-2nd best of experiment-I + 1st best of experiment-II, T4- 2nd best of experiment-I + 2nd best of experiment-II and control. It was replicated 4 times in CRD. The fruits treated with combination of irradiation dose and post- harvest treatment T1-0.40 kGy + GA3 @ 50 ppm recorded lower PLW (3.16%), spoilage (21.45%), per cent ripening (44.64%), total soluble solids (24.67°B), brix-acid ratio (66.87), reducing sugars (11.69 %), total sugars (13.05%) and higher firmness (3.10 Kg/cm2), titrable acidity (0.39 %), ascorbic acid (43.05 mg/100g). Highest shelf life (9.33) was recorded in fruits treated with T1-0.40 kGy + GA3 @ 50 ppm over control (5.00). Similarly highest organoleptic score (8.38) was obtained in fruits treated with T1- 0.4 kGy + GA3 @ 50 ppm.
Description
The experiment-III consists of T1-1st best of experiment-I + 1st best of experiment-II, T2-1st best of experiment-I + 2nd best of experiment-II, T3-2nd best of experiment-I + 1st best of experiment-II, T4- 2nd best of experiment-I + 2nd best of experiment-II and control. It was replicated 4 times in CRD. The fruits treated with combination of irradiation dose and post- harvest treatment T1-0.40 kGy + GA3 @ 50 ppm recorded lower PLW (3.16%), spoilage (21.45%), per cent ripening (44.64%), total soluble solids (24.67°B), brix-acid ratio (66.87), reducing sugars (11.69 %), total sugars (13.05%) and higher firmness (3.10 Kg/cm2), titrable acidity (0.39 %), ascorbic acid (43.05 mg/100g). Highest shelf life (9.33) was recorded in fruits treated with T1-0.40 kGy + GA3 @ 50 ppm over control (5.00). Similarly highest organoleptic score (8.38) was obtained in fruits treated with T1- 0.4 kGy + GA3 @ 50 ppm.
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Citation
Sri Konda Laxman Telangana State Horticultural University, Rajendranagar, Hyderabad-30