Chemical thinning improves the fruit size and quality in Silver King nectarine
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https://doi.org/10.5958/0974-0112.2020.00055.9Keywords:
Prunus persica, fruit set, growth, NAA, ethephon.Issue
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Abstract
The investigations were conducted to study the effect of chemical thinning on growth, yield and quality of Silver King nectarine during 2016-2017 at Division of Fruit Science, SKUAST-Kashmir, Srinagar, Jammu and Kashmir. Naphthalene acetic acid (NAA; 10, 20 and 30 ppm), ethephon (50, 100, 150 ppm) and urea (0.2, 0.4 and 0.6 %) were sprayed one week after petal fall. The chemical thinners significantly increased the growth and reduced the fruit set and yield. The plants sprayed with NAA @ 30 ppm recorded highest annual shoot extension growth (52.46 cm), plant height (278.70 cm) and leaf area (36.95 cm2). Application of ethephon @ 150 ppm significantly reducted fruit set (52.91 %) and fruit yield (12.27 kg) alongwith increased fruit length (5.36 cm), fruit diameter (5.20 cm), fruit weight (73.12 g), soluble solid content (12.94oB), SSC/acid ratio (25.88) and total sugars (9.49 %) followed by NAA @ 30 ppm. On the basis of results obtained, it may be inferred that nectarine trees sprayed with ethephon @ 150 ppm one week after petal fall judiciously thinned the nectarine fruits, improved yield and quality of nectarine fruits and found to be more economical and effective chemical thinner.
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