ISHS Acta Horticulturae 662: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics
PHYSICAL AND CHEMICAL THINNING OF PEACH IN SUBTROPICAL NORTH EASTERN INDIA |
| Authors: | K. Dhinesh, D.S. Yadav |
| Keywords: | thinning, chemical thinning, peach |
| Abstract:
The shoots of 90-100 cm length were chosen in peach (Prunus persica Batsch.) variety TA-170 to standardize the optimum thinning intervals between fruits during 2001 and 2002. Thinning intervals of 5, 10, 15, 20 and 25 cm were adopted besides the control and the excess fruits were removed by hand. An increase in thinning interval from 5 to 15 cm resulted in significant increase in fruit weight (55.24 g), fruit diameter (59.00 mm), total soluble solids (12.80%), ascorbic acid (225.00 mg/100 g) and total sugars (6.32%). Further increase in thinning interval beyond 15 cm was not effective in improving the fruit characters. A thinning interval of 15 cm was found optimum for obtaining good quality fruits under the mid-hill conditions of Meghalaya. 2,4-D (50, 100 ppm), GA3 (100, 200 ppm), thiourea (2%, 3%) and carbaryl (0.06, 0.10%) were sprayed at full bloom stage on peach variety Flordasun during 2001 and 2002. All the treatments were significantly effective in improving the fruit characters over the control. The best thinning was obtained with thiourea 3% on 50 days after spraying which resulted in minimum fruit retention (48.50%). The best results for fruit weight (57.64 g), fruit diameter (57.40 mm), total soluble solids (12.85%), ascorbic acid (212.30 mg/100 g) and total sugars (6.15%) were found with GA3 100 ppm spray besides the least incidence for leaf curl (1.60%) on 15 days after spraying. | |
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