Vegetative Propagation of Taraxacum kok-saghyz with the Aid of Growth Substances

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Abstract
Four growth regulators, indolebutyric acid, naphthaleneacetic acid, naphthoxyacetic acid and naphthalene acetamide were tested as root promoting agents on T. kok-saghyz root cuttings. Each compound was applied by the solution method (16-hr. soak) at 10, 50, and 100 ppm. also in talc dusts at 50, 200 and 1000 ppm. In comparison with the control lots each compound caused an increase in the rooting percentage when applied at 50 ppm. conc. in soln. and at 1000 ppm. in talc. Indolebutyric acid and naphthaleneacetic acid were somewhat more potent as root-inducing agents than the other 2 compounds. A higher % of 1-inch cuttings rooted than of 1/2 or 3/4-inch cuttings. Under controlled conditions the optimum temp. for best rooting was at 60[degree]-65[degree]F. Considerable loss of cuttings from soft rot organisms resulted when the temp. of the rooting media was held at either 70[degree]-75[degree] or 80[degree]-85[degree]F. This temp. effect seemed accentuated in lots receiving the 100 ppm. soaking treatments. Plants grown from root cuttings set in the field in early spring produced an abundance of leaves and flowers but were quite restricted in root growth during early summer.

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