The analysis of the results on the productivity of bioethanol
and its water use efficiency supports the data previously
discussed. In fact, if the objective is just the production
of bioethanol, a longer cultivation period could be suggested.
On the contrary, if the objective is more addressed to an
optimization of water, flowering should be considered the
best harvest time. In general, despite the harvest time
considered, an increasing of water availability did not clearly
correspond to an increase neither of productivity nor of water
use efficiency.