The RUE value determined for sweet sorghum in this experiment, 3.48 g M J
−1
intercepted PAR, is in good agreement with
Mastrorilli et al. (1995), who, working in Southern Italy, reported
3.71 g M J
−1
and it is almost identical to the value 3.46 g M J
−1
obtained by Rosenthal et al. (1993) for grain sorghum in
Texas.
Conversely, the RUE value determined for giant reed in this
study, i.e. 5.74 g M J
−1
IPAR, is surprisingly high compared to other
energy crops. Heaton et al. (2008) reported a RUE value of 4.1 g M J
−1