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A study on the effect of Indole-3-butyric acid (IBA) on twelve genotypes of carnation (Dianthus caryophyllus L.) was conducted at the division of ornamental crops, Indian Institute of Horticultural Sciences, Hesaraghatta, Bangalore. The study revealed that among the twelve genotypes experimented, the highest per cent of rooting was recorded in the genotype Dark Dona (89 %) followed by Praga (84.50 %), whereas, the lowest rooting per cent was recorded in the genotype Malaga (62.50 %). Similar tendency of superiority was observed for days for root initiation, wherein the genotype Dark Dona took the least number of days for root initiation (16.50 days). The highest number of roots per cutting was recorded in the genotype Bizet (18.75) followed by Dark Dona (16.25). The genotype Bizet was recorded with the highest fresh (7.19 g) and dry weight (57.51 mg) of roots. The lowest fresh weight was recorded in the genotype Darjeeling (4.60 g) and was in par with the genotype Gioele (4.62 g). When it was dry weight of roots the lowest was recorded in the genotype Darjeeling (27.47 mg).
Keywords: Carnation, Indole-3-butyric acid, rooting per cent, root length.