Effect of some plant growth regulators on growth, flowering and yield of gladiolus (Gladiolus grandiflorus L.) as pre sowing corms treatment

摘要

An experiment was conducted to study the effect of growth regulators comprising GA_3 @ 50 and 100 ppm, NAA @ 50 and 100 ppm, Alar @ 250 and 500 ppm, MH @ 250 and 500 ppm, CCC @ 500 and 1000 ppm on gladiolus as corm treatment [soaked for 12 hours]. Results of the experiment envisaged that the growth parameters as well as yield attributes of gladiolus plants were significantly altered due to corm soaking of growth regulators. The maximum plant height (88.12cm), number of leaves (5.81), leaf length (40.01cm) and leaf length width (9.20cm) were observed in corm soaking of GA_3 @100 ppm treatment followed by GA_3 @ 50 ppm treatment. Among all treatments, GA_3 @100 ppm (40.10 days) recorded the earliest spike emergence followed by GA_3 @50 ppm (41.21 days). The spike emergence was delayed in CCC @ 1000 ppm (47.11 days) and in Alar @ 500 ppm (47.01 days). CCC @ 500 ppm treatment has significantly higher number of corms (1.05/plant) and cormels (5.01/plant). Application of GA_3 @100 ppm recorded the maximum number of marketable spikes (46.01 spikes/plot) with longer vase life and quality flowers.