Scheme of plow adjustment in a longitudinally vertical plane: A – mass center of the tractor; B – tractor traction point (point B – at the same time is the traction point of the plow linkage mechanism); C is the point of the instantaneous center of plow resistance; Р _xz – tractor traction force; Р _x is the projection of the tractor traction force on the OX axis; Р _z is the projection of tractor traction force on the OZ axis; R _XZ is the projection of the tractor traction force on the OZ axis; R _X – projection of the resistance force of the plow on the axis OX; R _Z– projection of the plow resistance force on the axis OZ.