Abstract
Orange is very popular as a fruit of consumption in Indonesia, including Riau. One type of citrus which is the mainstay of commodity cultivation in Riau province is siam orange (Citrus nobilis Lour.). Siam orange has a sweet, fragrant aroma and thin fruit skin. Siam orange cultivation needs improvement for having the best quality plants. One effort that can do is in vitro culture. The study aimed to determine the best IBA and NAA concentrations to trigger the formation of siam orange (Citrus nobilis Lour.) roots. This study using a Completely Randomized Design (CRD). The result of this study shows that the rooting percentage obtained 100% on all treatments. The fastest rooting obtained in 2 mg/L IBA treatment (7,67 days after planting). The highest number of roots obtained in the combination of 0.5 mg/L NAA with 1.5 mg/L IBA (2.67 units). The longest root obtained in the combination of 1.5 mg/L NAA with 0.5 mg/L IBA (2.27 cm).
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