Hazarika, B.N.R., DevarajaWangchu, L.2018-09-252018-09-252017-07-26http://krishikosh.egranth.ac.in/handle/1/5810074111The present investigation to study the effect of micronutrients and plant growth regulators on growth, yield and fruit quality of litchi (Litchi chinensis Sonn.) cv. Muzaffarpur under the foothills of Arunachal Pradesh was carried out during 2016 at Fruit Research Farm, Department of Fruit Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh. The experiment was laid out in Randomized Block Design with 9 treatments and 3 replications. The treatments were T1=ZnSO4 foliar spray @ 0.4 percent, T2=ZnSO4 foliar spray @ 0.8 percent, T3=Borax foliar spray @ 0.4 percent, T4=Borax foliar spray @ 0.8 percent, T5=2,4 -D foliar spray @ 10 ppm, T6=2,4 -D foliar spray @ 20 ppm, T7=GA3 foliar spray @ 20 ppm, T8=GA3 foliar spray @ 40 ppm and T9=Control.The effect of different micronutrients and plant growth regulators significantly influenced the plant growth characters viz., per cent increase in plant height (5.26 %) and per cent increase in canopy spread (6.12 %) which was recorded highest in T8 and was at par with T7. Shortest duration of flowering (21.63 days) was recorded by T6 at par with T5. Most of the fruit and yield parameters were significantly increased in which the highest fruit set was recorded in T5 (42.84 %) followed by T4 (42.10 %). The highest fruit size (37.30 mm) was recorded in T3 and was followed by T7 (37.04 g). Significantly increased fruit weight (22.88 g), aril weight (15.61 g) and juice content (9.89 ml) and decreased fruit cracking (5.07 %) was recorded in T7. Number of fruits per tree (1162.66), maturity (69.33 days) and fruit yield (26.82 kg/tree) were found to be significant and highest were recorded in T8 which is at par with T7. TSS (18.09 °Brix), total sugar (26.13 %), reducing sugar (14.49 %) and ascorbic acid (38.06 mg/100 ml) differed significantly where T1 recorded the highest and was observed to be at par with T7. Titratable acidity and malic acid however, were not significantly affected. All the shelf life parameters were significantly influenced by micronutrients and PGRs. The decreased PLW (11.46 %) was recorded in T8 and highest number of days in room temperature (3.93 days) was recorded in T7. Organoleptic test viz., colour (7.70), taste (8.08) and aroma (7.65) were significantly influenced by all treatments though highest was recorded in T1. From the present study it can be concluded that T8 was found to be significantly increased plant height, and canopy spread so it is best for vegetative growth parameters while, T1 significantly increased colour, taste, aroma and most of the biochemical parameters. So it can be concluded that T1 was best for most of the shelf life and quality parameters. T7 recorded significantly increased fruit weight, aril weight, juice content, number of days at room temperature and most of the parameters like plant height, canopy spread, maturity, number of days in room temperature, fruit yield, fruit size, physiological loss in weight, aroma, total soluble solids, total sugar, reducing sugar and ascorbic acid were found to be at par with highest whereas seed size was lowest. By this it can be concluded that T7 is best for growth, yield, shelf life and quality of litchi cv. Muzaffarpur.ennullThesis