ISHS Acta Horticulturae 662: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics
EFFECT OF PRE-BLOOM FOLIAR APPLICATION OF PLANT BIOREGULATORS ON GROWTH, FRUITING AND QUALITY OF APPLE UNDER WARMER AGROCLIMATIC CONDITIONS |
| Authors: | G. Sharma, S.A. Ananda |
| Keywords: | apple, NAA, BA, GA3, prebloom, bioregulator |
| Abstract:
The effects of pre-bloom foliar GA3, BA and NAA applications at green-tip stage of bud development to 15-20 years old Starking Delicious/M7 apple trees under warmer agroclimatic conditions were assessed. Applications of GA3 (10-40 ppm) and GA3 (10 ppm) + BA (5 ppm) resulted in significantly higher increase in vegetative growth over control, whereas applications of NAA (5-20 ppm) curtailed it. Though NAA applications lead to highest flower intensity and yield efficiency, the maximum increment in fruit-set (up to 62.84%) and fruit yield per hectare (up to 66.62%) over control was observed under the combined application of GA3 (10 ppm) + BA (5 ppm) + NAA (5 ppm). Fruit physical characteristics were best under the application of 10 ppm GA3 + 5 ppm NAA, but considering the overall improvement in quality parameters of fruits and increase in production, the combined pre-bloom foliar applications of GA3 (10 ppm) + BA (5 ppm) + NAA (5 ppm) were observed to be most efficient in marginal apple growing areas of Himachal Pradesh under temperature stress conditions. | |
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