<div class="htmlview paragraph">The development of the center pivot irrigation system has allowed a level of process control not previously attainable in commercial agriculture. This form of irrigation now forms the dominant method for new lands going under irrigation.</div> <div class="htmlview paragraph">Consideration of alternative power sources leads to the conclusion that diesel engines will provide an increasing proportion of the power systems used for center pivots. The operational characteristics of these systems will require special consideration by engine manufacturers if they are to adequately meet performance requirements.</div>