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    Effect of cutting method and indole butyric acid concentration on rooting of dahlia (Dahlia variabilis Desf.)
    (Punjab Agricultural University, 2022) Inderjeet Singh
    The present investigations entitled “Effect of cutting method and indole butyric acid concentration on rooting of dahlia (Dahlia variabilis Desf.)” was undertaken in the Department of Floriculture and Landscaping, Punjab Agricultural University, Ludhiana, during the year 2021-2022. The objectives of the study was to evaluate the effect of IBA (Indole-3-butyric acid) rooting hormone on rooting of softwood cuttings of dahlia excised from harvested tubers (with heel cuttings and without heel- experiment no. 1) and cuttings obtained from dahlia shoots (lateral and terminal- experiment no. 2) after flowering. These excised cuttings were given basal quick dip treatment with different concentrations of IBA (@500 ppm, 1000 ppm, 1500 ppm, 2000 ppm, 2500 ppm, 3000 ppm) including control (no IBA), and were planted in sand beds following completely randomized design replicated thrice with ten cuttings per treatment. The results obtained in the experiment 1 showed that, the cuttings treated with IBA @ 2500 ppm showed the maximum and statistically at par differences with the cuttings that were treated with IBA@1500-2000 ppm. The maximum mean percent survival (96.65 %), maximum rooting percentage (85.00%), highest mean number of roots per cutting (9.38), maximum number of leaf pairs (4.10), maximum collar diameter (3.31 mm) and maximum mean shoot and root dry weight (0.188 g and 0.130 g respectively). In experiment no. 2, lateral cuttings were found to be superior in rooting and growth characteristics as compared to terminal ones. The lateral cuttings treated with IBA @ 2500 ppm recorded maximum mean percent survival (66.66%), maximum rooting percentage (58.33%), highest number of roots per cutting (4.63), maximum number of leaf pairs (2.42), maximum root dry weight (0.067g), maximum shoot dry weight (0.078g) and maximum mean root-shoot ratio (0.80) with minimum mean number of days to root initiation (14.00). It is concluded from the study that quick dip treatment (5 sec) of basal cut ends (0.5-1.0 cm) of cuttings with IBA @1500 ppm (dissolved in ethanol) has been found effective in obtaining uniform rooting with enhanced rooting percentage and better quality rooted cuttings of dahlia.