This study evaluates changes that might come about in U.S. agriculture under energy shortages expressed in prices and supplies for energy. It analyzes shifts in production among regions and between irrigated and dry land agriculture if energy were limited in farming or if prices rose to higher levels. It also examines changes that could come about in cropping technology and crop mixes under these conditions. It evaluates changes in resource values and related quantities. Finally, it examines a pattern of agriculture consistent with minimizing the energy requirements of agriculture.