The cost
of collecting rice straw
also varied widely among
baler types (Table 4).
For the baler pulled by a tractor, the depreciation
and interest cost did not account for the cost of the tractor, but was
calculated as rental cost.
The collection cost already included the cost of handling straw bales to the side of the field, which ranged from VND 240,000 to 400,000 t−1 or from US$12 t−1 to US$18 t−1.