Green Napier grass grinding suitable for biogas plant feeding

As per market demand, we have designed green Napier grass grinders.
If the grass is harvested near ground level full length ( 10 to 15 feet height), required to first chop in t small size, and then it grinds.
If this grass harvest by machine which is is into 10 to 20 mm size, than only grinding will be sufficient.
We can provide machines as per the required working capacity.