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Effect of PGRs combination on pre-harvest fruit drop of Khasi mandarin (Citrus reticulata Blanco.)

S. R. Singh*, L. Wangchu, Barun Singh, B. N. Hazarika, A. K. Pandey

College of Horticulture & Forestry, Central Agricultural University, Pasighat-791 102, Arunachal Pradesh, India

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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. 

Khasi mandarin, PRG, Pre-harvest, Fruit drop, Fruit retention.
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