Effect of Plant Growth Regulators on Yield, Quality and Shelf life of Guava (Psidium guajava L.) under High Density Plantation
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Date
2022-09
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigations entitled “Effect of Plant Growth Regulators on Yield, Quality and Shelf life of Guava (Psidium guajava L.) under High Density Plantation” was carried out at Research Farm, SKUAST-Jammu, Main campus, Chatha, during 2021-2022. There were nine treatments comprising of foliar application of NAA @ 100 and 150 ppm, GA3 @ 75 and 150 ppm, applied individually, NAA 100 ppm in combination with GA3 75 ppm, NAA 100 ppm in combination with GA3 150 ppm, NAA 150 ppm in combination with GA3 75 ppm, NAA 150 ppm in combination with GA3 150 ppm and control (water spray). The results of experiment revealed that application of NAA 150 ppm in combination with GA3 150 ppm significantly increased relative growth rate (3.37 mm mm-1 month-1), average number of leaves per shoot (51.08), chlorophyll content (50.50 SPAD value), chlorophyll a (1.32 mg/g fresh weight), Chlorophyll b (0.97 mg/g fresh weight), total chlorophyll (2.29 mg/ g fresh weight) and carotenoid (0.64 mg/g fresh weight). Application of NAA 150 ppm in combination with GA3 150 ppm significantly increased average number of flowers per shoot (7.08). Initiation of flower was recorded earliest (8th Sep) with GA3 150 ppm. However, minimum flower duration (39.92 days) and minimum days to fruit maturity (99.17 days) was recorded with GA3 150 ppm. Application of NAA 150 ppm in combination with GA3 150 ppm recorded maximum number of fruits per shoot (6.75), fruit length (6.87 cm), fruit breadth (6.94 cm), fruit weight (147.19 g), fruit volume (139.13 cc) and yield (17.50 kg/plant). The quality of fruits in terms of TSS (10.95 °Brix), ascorbic acid content (193.74 mg/100 g), reducing sugars (5.02 %), non-reducing sugars (3.98 %) and total sugars (9.32 %) were significantly highest with NAA 150 ppm in combination with GA3 150 ppm. Titratable acidity (0.37 %) was significantly reduced with NAA 150 ppm in combination with GA3 150 ppm. For shelf-life studies, fruits after harvest were stored at ambient temperature and fruits were analyzed at 3 days intervals. The finding of the experiment revealed that all physical and biochemical parameters of guava showed decreasing trend with advancement in storage intervals. Minimum mean physiological loss in weight (4.69 %), mean rotting percentage (8.89 %), mean titratable acidity (0.31 %) and maximum mean fruit length (6.85 cm), mean fruit breadth (6.92 cm), mean fruit weight (140.28 g), mean fruit volume (134.29 cc), mean fruit firmness (6.75 kg/cm2), mean TSS (10.66 °Brix), mean ascorbic acid content (173. 39 mg/100 g) and mean organoleptic rating (6.87) were recorded with NAA 150 ppm in combination with GA3 150 ppm under ambient storage conditions.
From the present investigation, it is concluded that application of NAA 150 ppm in combination with GA3 150 ppm resulted in maximum fruit size, yield with better shelf life in guava.
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Preferred for your work. Thakur, S. 2022. Effect of Plant Growth Regulators on Yield, Quality and Shelf Life of Guava (Psidium guajava L.) under High Density Plantation, M.Sc. Thesis, SKUAST-Jammu, India