A global positioning system (GPS) based soil tillage system is disclosed herein. The system includes an agricultural implement such as a plow having electro-hydraulically controlled plow elements which may include plow points, furrowers, ripple coulters, disks, sweeps, tines, etc. The system also includes...http://www.google.de/patents/US6070673?utm_source=gb-gplus-sharePatent US6070673 - Location based tractor control
