Abstract
In calculating the rate of plowing, the ime required for turning on the headland differs depending on whether the tractor is driven only forward, or both forward and reverse. And so, first we must begin by diciding this value (See Fig. 1).
Secondly, in case the turning is contained in futile run, we must correct the value in anticipation of the velocity reduction (30-40%).
And moreover, in case the tractor run over the furrow slices on the cultivated headland, we must include the velocity reduction (10%at running straight ahead, 15-20% at turning) in calculating the rate of plowing.
