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Effects of Naphthaleneacetic acid (NAA) on culm cuttings of Thyrsostachys siamensis Gamble

The objective of this study was to evaluated the effects of Naphthaleneacetic acid (NAA) on shooting rate, number of shoots per cut, rooting rate, number of roots per cut by culm cuttings of Thyrsostachys siamensis Gamble. In the study, the bamboo samples were treated with NAA at different concentrations and time intervals. The experiment was designed in a randomized complete block of 2 factors with 17 treatments and 3 replications, with 36 culm cuts per treatment. The results showed that the treated groups with NAA had very high shooting rate, while the shooting rate of the control was relatively low. The concentration of NAA and soaking time significantly affected the shooting rate, number of shoots per cut, rooting rate, number of roots per cut. The interaction between NAA concentration and soaking time was significant. The result suggests that soaking in NAA at the concentration of 200 ppm and 120 minutes is the most appropriate treatment.