Agriculture Information Bulletin, Issue 431U.S. Department of Agriculture, 1979 - Agricultural conservation |
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1-percent increase 1.1 percent 7-percent real agricul Agricultural Experiment Station agricultural productivity growth agricultural research American Revolution basic high technology bioregulators compounds carbohydrates through exposure carbon dioxide Civil War hand commercial adoption ductivity E expenditures education index emerging technologies Expected values farm programs genetic growth in agricultural Growth in U.S. growth rate hand power high technology scenario historical rate horse power impact on productivity impacts on agricultural increase 7 percent increase productivity influence productivity growth insecticides internal rate Leroy Quance limit to growth limits to agricultural longrun low technology Lu and Leroy mechanical power nitrogen fixation percent annually period photosynthesis enhancement formation Present science power productivity growth curve prolong shelf rate of return research and extension ripening or prolong S-shaped curve S-shaped growth curve three scenarios tractors tural twinning in beef U.S. agricultural productivity U.S. Department unprecedented impacts unprecedented technological breakthroughs World World War II Yao-chi Lu