sweetcorn
He didn't burn the cornstalks at the end of the season, but left them on the earth to rot.
The cornstalks would support the beans as they were growing, and the beans would provide much-needed nitrogen for the corn.
They will be able to burn biomass such as grasses or cornstalks along with coal.

SMART Vocabulary: related words and phrases

Crop plants & economic plants
beet
black mustard
brassica
breadstuff
canola
fat hen
field corn
flax
flaxseed
flint corn
multi-line
neep
oilseed rape
opium poppy
rabi
tall fescue
turfgrass
vetch
wheatgrass
white clover