EFFECT OF FOLIAR SPRAYS OF BIOREGULATORS ON GROWTH AND FLOWERING IN GLADIOLUS

摘要

Effect of different plant growth regulator sprays (GA3, TIBA, CPPU and BR) on growth and flowering of two gladiolus cultivars Darshan and Dhiraj was investigated for two consecutive years, 2008-09 and 2009-10. Growth regulators were sprayed at 3rd and6* leaf stage. Cv. Darshan differed significantly with cv. Dhiraj in respect to plant height, leaf area and flowered earlier. GA_3150 ppm followed by brassinosteroid (BR) 10 ppm recorded maximum plant height, number of leaves and leaf area during vegetative growth and resulted in earlier flowering. TIBA 100 ppm, TIBA 50 ppm and control recorded significantly minimum leaf area and showed delayed flowering. Cv. Dhiraj recorded maximum percentage of plants flowered than the cv.Darshan. Cv. Darshan recorded significantly highest spike length and inter floret length and minimum days to wilting of spike over the cv. Dhiraj. Cv. Dhiraj was significantly superior over cv. Darshan in respect of number of florets per spike and longevity of spike. Maximum spikelength and weight, number of florets per spike and spike field life were recorded with GA_3 150 ppm. Lowest values in respect of flower parameters were recorded with TIBA treatments and control.