The samples comprised 13 different cultivars, including one male
and 12 females ranging from 1 year to approximately 120 years old.
Samples were taken from different burnable parts, including leaflets,
midribs, spikelets, spathes, frond bases, offshoots, and exposed
roots. The samples were dried under direct sun, heated in an oven
for 48 h at 40e60 C, and milled down to three different sizes: 0.5, 1
and 2 mm. Next, the different samples were thoroughly mixed
together. Three final samples were chosen for calorimetry.