Nautiyal, Dr. B.P.Pant, Rajani2017-11-022017-11-022015-07http://krishikosh.egranth.ac.in/handle/1/5810034494A synthetic cytokinin, Sitofex (CPPU) was applied for growth and quality of apple in different doses (2.5, 5.0, 7.5 and 10 ppm) and timing (full bloom and pea stage) at temperate conditions of Uttarakhand University of Horticulture and Forestry, Bharsar above 1900 meter mean sea level. The effect was observed for yield, fruit weight, dimensions and chemical fruit quality of Red Delicious apple. Two ideal spray of 10 ppm sitofex after full bloom and pea stage had marked effect on fruit setting, yield, fruit weight and dimensions, as well as chemical fruit quality. These doses were responsible for reducing physiological weight loss and acidity in the fruit. These effects either in increase or decrease was associated with increasing sitofex concentrations. The maximum fruit per branch increased 2 fold, fruit diameter 1.33 to 1.47 times, fruit weight 75%, fruit volume 79%, total sugar 14.2%, with 10 ppm sitofex application as compared to control. Maximum yield 37.26 kg tree-1 with 10 ppm sitofex was superior to 2.5, 5.0, 7.5 ppm sitofex application. The yield was minimum in control, 28.09 kg tree-1. The maximum fruit yield increased 32.65% with sitofex application as compared to control. These findings demonstrate the positive effects, no negative effects and most promising commercial applications of sitofex in apple.ennullThesis