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ThesisItem Open Access Studies on chemical thinning for quality improvement in Japanese plum (Prunus salicina Lindl.) cv. Kala Amritsari(CCSHAU, 2017) Rajput, Vinita; Bhatia, S.K.The present investigations entitled “Studies on chemical thinning for quality improvement in Japanese plum (Prunus salicina Lindl.) cv. Kala Amritsari”, was carried out on the eleven year old plum trees planted at a spacing of 6 m x 6 m at experimental farms of Department of Horticulture, Chaudhary Charan Singh Haryana Agricultural University, Hisar during the year 2014-16. The three individual experiments, viz. foliar application of GA3 for flower inhibition, chemical blossom thinning and chemical fruitlet thinning were performed. GA3 at 25, 50, 75 and 100 ppm was spayed before the leaf fall stage in year 2014. The blossom thinning chemicals, urea (4 & 6%), ATS (2 & 4%) and NAA (20 & 40 ppm) were spayed at full stage. The fruitlet thinning chemicals, thiourea (2.5 & 5%), NAA (50 & 100 ppm) and ethephon (50 & 100 ppm) were sprayed after fruit set when the fruits attained pea size. The observations regarding, flowering, fruiting and fruit quality parameters were recorded at different time during the year 2015 and 2016. The application of GA3 at 100 ppm was found most effective in reducing crop load (49.22% and 44.02% reduction in flowering) and increased fruit weight (15.68 g) followed by GA3 applications at 75 ppm as compared to control. Quality parameters (TSS, TSS/acid ratio, sugars etc.) were recorded highest in 75 ppm GA3 treatment. The blossom thinning with ATS at 4% resulted in minimum number of fruits per shoot (32.64, 28.11) and thereby increased fruit size (24.87 mm & 22.82 mm length) and quality parameters followed by ATS treatment at 2%. Among the chemicals used for fruitlet thinning, ethephon at 100 ppm (20.74, 18.27) followed by ethephon at 50 ppm (22.13, 21.00) resulted in minimum number of fruits per shoot and the fruit quality parameters (TSS- 14.65%, 13.70%) were found to be maximum with the application of ethephon at 100 ppm followed by application of NAA at 100 ppm and ethephon at 50 ppm. All the chemical thinning treatments significantly reduced the crop load on tree, increased leaf to fruit ratio, leaf area, fruit weight, fruit size and improved fruit quality, but reduced total yield as compared to control in both the years.