Abstract: The research of Jimene et al. (2002) using semi-continuous fermentors has shown that inducing of tubers during two weeks is observed and their number is not increased after this period. So, it seems that tubers induction during the first two week, in inducing medium finishes. This means that the inducing tissues of tubers and the growth condition of tubers must be provided during this period. In contrast, the total weight of tubers increaser stably during the ten weeks of culture period, meanwhile, the total weight of culture, due to branch growth, roats and the microtubers will increase up to the end of the inductive period.