Effects of phytohormones and position on mother stem on culm cutting of Thyrsostachys siamensis gamble

Abstract

The effects of phytohormones and positions on mother stem on shooting rate, number of shoots per cut, foot diameter of shoots, height of shoots, rooting rate, average number and length of roots by culm cuttings of Thyrsostachys siamensis Gamble Nam Bo were investigated. In this study, the phytohormones used were NAA, IBA and HVP. Cuttings were taken in three positions: near the root (V1), between the stem (V2) and near the tops (V3). The experiment was arranged randomly with 3 replications, with 36 culm cuttings per treatment. The results showed that the groups treated with NAA had highest shooting rate (91.7%) and highest number of shoots per cut (3.39 shoots/cut). The phytohormones did not significantly affect the foot diameter of the shoots but the height of the shoots. The NAA gave highest rooting rate (87.04%) and highest number of roots (8.5 roots/cuttings). The positions on mother stems did not significantly affect the shooting rate, but they significantly affected the number of shoots per cut. The foot diameter of the shoots, the height of the shoots, the rooting rate and the average root length of the cuttings taken between the stems were greater than those of near the root and near the top. In addition, the highest number of roots was observed when cuttings were taken at near the root