Effect of Indole-3-butyric acid and time of stem cuttings on rhizogenesis of Cupressus macrocarpa cv. Goldcrest

Abstract

The studies on “Effect of Indole-3-butyric acid and time of stem cuttings on rhizogenesis of Cupressus macrocarpa were carried out during the year 2020-2021 at the experimental farm of the Division of Floriculture and Landscape Architecture, SKUAST-K, Shalimar campus to investigate the effects of dipping cuttings in rooting hormone (IBA) and different time of planting on rooting ability of Cupressus macrocarpa. The experiments comprised of 12 treatment combinations replicated thrice and were laid under Completely Randomized Design. Each treatment comprised of twenty cuttings. Treatment combinations consist of four levels of IBA (0ppm, 1500 ppm, 3000 ppm and 4500 ppm) and three different months of planting. Cuttings were given quick dip treatment of (50-60 seconds) with various concentrations of IBA. The cuttings of Cupressus macrocarpa were planted in three different months viz., Ist week of July, Ist week of August and Ist week of September. The cuttings planted in the Ist week of July was most effective in inducing earlier root formation and maximum number of primary adventitious roots, number of secondary adventitious roots, length of primary root per cutting, root volume, length of cutting, collar diameter, percent cuttings rooted and survival of rooted cuttings. Among various levels of IBA, 4500 ppm IBA was most effective than other concentrations of IBA (1500 ppm & 3000 ppm).