Overall main effect of hormone type, level and genotype on Amur maple rooting A) percentage (PR), B) mean number of roots/cutting (MNR) and C. mean root length (MRL). Mean separations are indicated by a - f as determined by Tukey's test (p = 0.05) and error bars are standard error. Abbreviations: indole-3-butyric acid (IBA), naphthalene acetic acid (NAA), parts per million (ppm).