EFFECT OF APPLICATION OF PGR AND CHEMICALS ON FRUIT SET, YIELD, QUALITY AND SHELF-LIFE OF CUSTARD APPLE (Annona squamosa L.) CV. SINDHAN 2929
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Date
2019-08
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JAU, JUNAGADH
Abstract
The present investigation entitled “Effect of application of PGR and chemicals
on fruit set, yield, quality and shelf-life of custard apple (Annona squamosa L.) cv.
Sindhan” was carried out at Madhdi Baug Farm, Department of Horticulture, Junagadh
Agricultural University, Junagadh, during the year 2018-2019. The experiment was laid
out in Randomized Block Design with factorial concept (FRBD) consisting three
factors viz., GA3 spray (G1 50 ppm GA3, G2 100 ppm GA3 and G3 150 ppm GA3), CaCl2
spray (C1 1 % CaCl2, C2 1.5 % CaCl2 and C3 2 % CaCl2), boron spray (B1 0.2 % boron
and B2 0.4 % boron) was considered as treatment and replicated thrice.
The maximum no. of fruit/tree (96.33), fruit yield (16.98 kg/tree), pulp weight
(70.81 g). Maximum, fruit length (8.00, 7.99, 7.97 and 7.94 cm), fruit diameter (8.08,
8.13, 8.15 and 8.12 cm), fruit volume (133.33, 130.67, 121.67 and 116.77 cm3
), fruit
weight (182.67, 178.07, 168.96 and 160.83 g), total sugar (7.43, 23.78, 24.34 and 24.17
%), reducing sugar (4.47, 18.83, 19.11 and 19.00 %), non reducing sugar (2.96, 4.95,
5.23 and 5.17 %) ascorbic acid (37.67, 34.00, 23.67 and 23.33 mg/100g pulp) at harvest,
2
nd, 4th and 6th day interval, respectively. Maximum total soluble solid (24.33, 27.36
and 26.67 ˚Brix) and minimum physiological loss in weight (2.52, 7.51 and 11.96 %)
at 2
nd, 4th and 6th day interval, respectively minimum spoilage (20.00 and 33.33 %)
maximum marketable fruit (80.00 and 66.67 %) 4
th and 6th day interval, respectively
shelf life (6.67 days), appearance (8.00), flavour (8.42), taste (8.57) were recorded
under the application of GA3 @ 50 ppm, CaCl2 @ 2 % and boron @ 0.2 % G1C3B1.While, maximum fruit set (17.33 %) noted under GA3 @ 50 ppm, CaCl2 @ 2 % and
boron @ 0.4 % G1C3B2 and GA3 @ 100 ppm, CaCl2 @ 2 % and boron @ 0.2 % G2C3B1
application recorded minimum fruit drop (11.50 %).
Here it can be concluded that among different PGR and chemicals pre harvest
spray at the time of flowering, 30 days after first spray and 60 days after first spray of
gibberellic acid 50 ppm, calcium chloride 2 % and boron 0.2 % found to be most
effective for getting higher yield with superior quality fruits.