? ??????? ???????? ????? ??? ????? ?????? ???????, ??? ??????? ??? ???? ?? ????? ??????? ?? ???????? ??????? ?? ??????????:These early tractors have been cumbersome, and sick-suited to enter a discipline of planted row crops for weed Management. The "common" tractor definition is now not in present-day use. Having said that, tractors with preset wh