The effect of Rootone-F concentrations and type of culm cuttings on growth of back petung bamboo (Dendrocalamus asper (Schult.) Backer ex Heyne cv. Black)

Limited propagation material of black Petung bamboo (Dendrocalamus asfier (Schult.) Backer ex Heyne cv. Black) caused us to investigate bamboo culm cuttings as a propagation material. This bamboo variety is very limited particularly in Bali, where it was introduced from Java in 1998. The aims of this research are to understand the effect of Rootone-F concentration and the best culm cutting material for growth of black fetung bamboo. This research used Randomized Factorial Design between Rootone-F concentrations and type of culm cuttings. The first factor is Rootone-F concentrations, consisting of 0 mgll, 200 me/\, 400 me/1,600 mgll, and 800 mgl L The second factor is culm cuttings, consisting of middle, and top. There are 10 combinations among two factors with 3 repetitions. Analysis variance revealed that the interaction between Rootone-F concentration and kind of culm cutting significantly influenced toward leaf width (sign. 5%) and root length (sign. 17o). In addition, type of culm cutting gave also significantly influence toward shoot number (sign. IVo) Ieaf number (sien.5%), leaf width (sign. 5%), root number (sign.5%), and root length (sien. 1%); while Rootone-F concentration was significantly influence toward shoot height (sign. 5%), leaf number (sign. 5%), leaf width (sien. 57o), and root length (sign. I 7o). The combination between 400 ms/l of Rootone-F and middle culm cutting revealed the first results ranking to leaf number (8.91), and root length (72.17 cm); second ranking to shoot height (38.6 cm), leaf width (61.44 cm'?) and root number (34.33); third ranking to shoot number (2.78). According to those results, we concluded that 400 mg/l of. Rootone-F and middle culm cutting was the best combination among nine other combinations. Rootone-F with concentration of 400 mgll could be used to enhance growth of middle culm cutting of black fietang
bamboo.