The work path of plow tillage followed Cshape
of round trip pattern 16. The C-shape path comprised three
steps: preparation of descending the 3-point hitch, operation of
proceeding plowing forward, and completion of ascending the 3-
point hitch and steering for turning. In addition, working hours
and tillage depth were measured to verify tillage performance of
tractor during plow tillage. Working hours was defined as one
cycle of plow tillage, and it was measured using the data acquisition
system. Tillage depth was means of 10 measured data, which
measured at different points on working path using depth digital
calipers (327-12-0, ASIMETO, Germany). The plow used in this
study was an eight-furrow common plow (SW-PN2408, Sewoong,
Korea) with furrow width of 2,420 mm, its dimensions were 2,465
mm × 2,415