Abstract
The synthetic auxin like 2,4-D, 2,4,5-T and NAA were investigated on ten (10) years old tree to study the effect of different combinations of PGR on pre-harvest fruit drop at Bodak village under East Siang district of Arunachal Pradesh, India during the year 2014-2015. Result showed maximum fruit retention in T6 Urea 1% + 2, 4- @ 15ppm (45.4%) followed by T5 NAA@5ppm + 2,4-D@10ppm (44.3%) resulting significantly increased the total number of fruits in (T6) (244.3 fruits / tree) followed by T5 (241.6 fruits/tree) as compared to control (17.3% fruit retention and 181 fruits/ tree) Hence, the combination of recommended dose of fertilizer i.e. 400:400:900g NPK/plant/year along with Urea 1% + 2, 4- @ 15ppm foliar spraying thrice during April, July and September can be used to control the fruit drop in Khasi mandarin.
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