Local autonomous power supply systems are generally limited to stationary applications which, although of vital importance to farm mechanization, still represent a considerably smaller fraction of total energy than that used in mobile mechanization systems powered by tractors and other engine-driven vehicular equipment.
Transport, along with primary tillage, is one of the first uses of new sources of mobile power. Where distances are long, trucks rather than tractors are used for farm-to-market transport. Harvesting. Without machinery, harvesting is very labor-intensive.