Influence of phosphorous and potassium nutrition on growth, yield and fruit quality of Gala Mast apple – Iqra Fayaz, Umar Iqbal, Amit Kumar, M. Maqbool Mir, Irfan Bisati and M. H. Chesti
2021
Iqbal, Umar
Present study was conducted at the experimental field of Division of Fruit Science, SKUAST-Kashmir, Shalimar Campus, Srinagar (Jammu and Kashmir) on four-year-old Gala Mast apple grafted on MM106 rootstock under high density plantation (3m × 3m) to standardize the optimum dose of phosphorous and potassium. Sixteen treatment combinations consisting of four levels each of phosphorous (25 g, 50 g, 75 g and 100 g/tree) and potassium (150 g, 200 g, 250 g and 300 g/tree) were tested. Maximum increase in tree height (55.89 cm), tree girth (2.31 cm), annual shoot extension (47.13 cm), leaf area (42.00 cm2 ), fruit length (6.52 cm), fruit diameter (7.31 cm), fruit weight (168.26 g), fruit volume (185.48 cm3 ), yield (6.85 kg/tree), total soluble solids (15.85oB), total sugars (13.17 %), ascorbic acid (5.89 mg/100 g) and anthocyanin content (9.27 mg/100 g) were observed with the application of phosphorous @ 100 g + potassium @ 300 g. Highest fruit firmness (9.81 kg/cm2 ) was recorded when phosphorous @ 100 g + potassium @ 150 g was applied, whereas minimum acidity (0.197 %) and maximum TSS/acid (76.47) ratio was recorded with the application of phosphorous @ 25 g + potassium @ 300 g. Therefore, it can be concluded that phosphorous @ 100 g/tree in combination with potassium @ 300 g/tree proved to be most economical and effective in improving growth, yield and quality of apple cv. Gala Mast.
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