Standardization of season,shoot etiolation and growth regulators in air-layering of guava (Psidium guafava L.) var. L-49 under east Siang district of Arunachal Pradesh

摘要

The experiment on the effect of season, shoot etiolation and growth regulators in air-layering of guava (Psidium guajava L.) var. L-49 was carried out at Fruit Research Farm, Department of Fruit Science, College of Horticulture and Forestry, Central Agricultural University, Pasighat, Arunachal Pradesh in the years 2011-12 and 2012-13. The experiment was laid out in completely randomized design (CRD) with three factors i. e. month, shoot and PGR, with four levels in month, two levels in shoot and five levels in PGR, with three replications of each level. The PGR treatments were IB A (20000 ppm), NAA (20000 ppm), IBA+NAA (10000 ppm+10000 ppm), paclobutrazol (500 ppm) and control. The air-layers with treatment T3 (IBA 10000 ppm+NAA 10000 ppm) recorded maximum number of primary roots (24.33) in June on etiolated shoot and treatment T1 (IBA 20000 ppm) in July on non-etiolated shoots (22.33). Hence, the treatments Tt (IBA 20000 ppm) and T3 (IBA 10000 ppm+NAA 10000 ppm) during the month of June on etiolatedand treatment T1 (IBA 20000 ppm) in July on non-etiolated shoots were the best treatments for getting maximum rooting and survival per cent of air-layers.