Singh S, RomenINDIRA DEVI, SANABAMHazarika, B.N.2021-09-302021-09-302021-09-22https://krishikosh.egranth.ac.in/handle/1/5810176449The present investigation was conducted to evaluate the effect of foliar application of NAA and micronutrients on litchi cv. Muzaffarpur. It was carried out on 10 years old trees of uniform size at the Fruit Research Farm (Litchi Block), Department of Fruit Science, College of Horticulture and Forestry, Pasighat, Arunachal Pradesh during the year 2020-21. The experiment was laid out in Randomized Block Design (RBD) with 10 treatments and 4 replications. The treatments applied were: T1 (NAA @ 10 ppm), T2 (NAA @ 15 ppm), T3 (NAA @ 20 ppm), T4 (NAA @ 25 ppm), T5 (NAA @ 10 ppm + 0.5% Borax + 0.5% Zinc sulphate), T6 (NAA @ 15 ppm + 0.5% Borax + 0.5% Zinc sulphate), T7 (NAA @ 20 ppm + 0.5% Borax + 0.5% Zinc sulphate), T8 (NAA @ 25 ppm + 0.5% Borax + 0.5% Zinc sulphate), T9 (0.5% Borax + 0.5% Zinc sulphate) and T10 (Control).Experimental results revealed that the imposition of different treatments had a significant effect on increasing flowering, fruit setting and improving the yield and quality of the fruits. Maximum increase in plant height (36.50 cm), canopy height (34.95 cm), volume of the canopy (68.70 m3), highest number of female flower/panicle (75.00), fruit setting %/panicle (26.25%), number of fruits at harvest stage/panicle (15.00), maximum yield/plant (24.00 kg), maximum TSS (18.75ºBrix), ascorbic acid (25.70 mg/100 g), total sugar (15.70%), reducing sugar (10.05%) with minimum titratable acidity (0.24%) were recorded in treatment T8 (NAA @ 25 ppm + 0.5% Borax + 0.5% Zinc sulphate) whereas, date of 50% flowering (1st March) i.e. early flowering, early fruit maturity (25th May), maximum fruit diameter (2.54 cm), fruit volume (18.40 cm3), fruit weight (20.60 g), aril weight (13.24 g), juice content (9.20 ml) with minimum fruit cracking%/plant (3.61%) were obtained in treatment T7 (NAA @ 20 ppm + 0.5% Borax + 0.5% Zinc sulphate). However, non-significant effect was found in stem girth, fruit length and shelf life of the fruits. Therefore, application of recommended dose of fertilizers (1200:500:600 g NPK/plant/year) along with foliar spray of NAA @ 25 ppm + 0.5% Borax + 0.5% Zinc sulphate thrice (first application after emergence of new flushes during November followed by second application at one month interval during December and third application after fruit setting during April) can be recommended to the litchi growers under foothills condition of Arunachal Pradesh to increase the yield and productivity.EnglishThesis