Wangchu, L.Longdo, RishiSingh, S. R.2018-09-222018-09-222015-08-22http://krishikosh.egranth.ac.in/handle/1/5810073966The experiment on the effect of growth rergulators and time of air layering in litch (Litchi chinensis Sonn.) cv. Muzaffarpur was carried out at Fruit Research Farm, Department of Fruit Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh in the year 2014 – 2015.The experiment on the effect of growth rergulators and time of air layering in litch (Litchi chinensis Sonn.) cv. Muzaffarpur was carried out at Fruit Research Farm, Department of Fruit Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh in the year 2014 – 2015. The experiment wa laid out in completely Randomized Design (CRD) with two factors i.e. Month and PGR, with 3 level in month and 7 levels in PGR, with three replications of each level. The PGR treatments were IBAA (1000 ppm), IBA (2500 ppm) and IBA (3000ppm), IBA (5500ppm), NAA (5000 ppm), IBA + NAA (4500 ppm + 200 ppm) and control. Use of T6 (IBA 4500 ppm + 200ppm) during the month of July for air layering significantly influence the days of first root initiation, fresh weight of primary roots, dry weight of secondary roots and survival percentage of air layers. Also the sifnificant influence were resulted in numbers of primary roots and numbers of secondary roots by the use of T5 (NAA 5000 ppm) during the month of August and July respectively. The combination of T3 (IBA 3000 ppm) in the month of August significantly increased the dry weight of primary roots. Use of T1 (IBA 1000 ppm) in the month of September significantly increased the survival percentage of air layers.ennullThesis