Energy profiles of an agricultural frontier: the American Great Plains, 1860–2000

Earth & Environmental Sciences

• energy 64%
• energy flow 18%
• productivity 16%
• pasture 15%
• farm 13%
• biomass energy 10%
• transition 10%
• ecosystem 9%
• milk 8%
• soil quality 8%
• machinery 8%
• twentieth century 8%
• meat 8%
• import 8%
• mosaic 7%
• labor 7%
• livestock 7%
• colonization 7%
• fossil fuel 7%
• wildlife 7%
• fertilizer 7%
• grassland 6%
• spatial variation 6%
• market 5%
• crop 5%
• consumption 5%
• rainfall 5%
• land 4%