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Crop yields -- Mathematical models

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• Crop yields
• Agricultural productivity -- Mathematical models
• Field crops -- Mathematical models
• Mathematical models

• Crop yields -- China -- Mathematical models
• Crop yields -- India -- Mathematical models
• Crop yields -- Iowa -- Mathematical models
• Crop yields -- Texas -- High Plains -- Mathematical models
• Crop yields -- United States -- Mathematical models

• World climate and world food systems IX : Models for wheat yield in India with inclusion of climatically induced variability (Communications Office, Institute for Environmental Studies, University of Wisconsin, 1977), by Victor R. Scherer (page images at HathiTrust)
• World climate and world food systems VII : a predictive model for wheat yield in Sonora, Mexico (Madison : institute for Environmenta Studies, University of Wisconsin-Madison, 1977), by Patrick J. Michaels and Victor R. Scherer (page images at HathiTrust; US access only)
• Determination of the optimal level for combining area and yield estimates (Purdue University, LARS ;, 1981), by Marilyn M. Hixson, C. D. Jobusch, United States National Aeronautics and Space Administration, Lyndon B. Johnson Space Center, Purdue University. Laboratory for Applications of Remote Sensing, AgRISTARS (U.S.), and United States. Dept. of Agriculture (page images at HathiTrust)
• Optimizing crop production through control of water and salinity levels in the soil (Utah Water Research Laboratory, College of Engineering, Utah State University, 1977), by J. I. Stewart and Utah Water Research Laboratory (page images at HathiTrust; US access only)

• World climate and world food systems X : Models for national (aggregated) wheat yield in the People's Republic of China ... (Institute for Environmental Studies, University of Wisconsin, 1977), by Victor R. Scherer (page images at HathiTrust; US access only)

• Models for wheat yield in India with inclusion of climatically induced variability (Climate/Food Research Group, Center for Climatic Research, Institute for Environmental Studies, University of Wisconsin, 1977), by Victor R. Scherer (page images at HathiTrust; US access only)

• Crop weather models of corn and soybeans for agrophysical units (APU's) in Iowa using monthly meteorological predictors (Lyndon B. Johnson Space Center, NASA ;, 1982), by Sharon LeDuc, Lyndon B. Johnson Space Center, AgRISTARS (U.S.), and United States. Dept. of Agriculture (page images at HathiTrust)

• Establishing crop acreage flexibility restraints for subregions of the Texas High Plains (Texas Water Resources Institute, Texas A&M University, 1977), by Gary D. Condra, Ronald D. Lacewell, Texas Agricultural Extension Service, Texas Agricultural Experiment Station, Texas Water Development Board, United States. Office of Water Research and Technology, and Texas Water Resources Institute (page images at HathiTrust; US access only)

• Methodologies for valuation of agricultural crop yield changes : a review (Corvallis Environmental Research Laboratory ;, 1978), by Steve Leung and Corvallis Environmental Research Laboratory (page images at HathiTrust)

• Methodologies for valuation of agricultural crop yield changes : a review (Corvallis Environmental Research Laboratory ;, 1978), by Steve Leung and Corvallis Environmental Research Laboratory (page images at HathiTrust)

Items below (if any) are from related and broader terms.

• Sulfuric Acid Rain Effects on Crop Yield and Foliar Injury (Corvallis, OR: Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, ca. 1980), by Jeffrey J. Lee, Grady E. Neely, and Shelton C. Perrigan
  • multiple formats at Google
  • page images at HathiTrust
• The Law of Diminishing Returns (Yonkers-on-Hudson and Chicago: World Book Co., 1924), by W. J. Spillman and Emil Lang
  • page images at Cornell
  • page images at HathiTrust
• Adequacy and reliability of crop-yield estimates (Washington, D.C., 1932), by Charles Faye Sarle (page images at HathiTrust; US access only)
• Root behavior and crop yield under irrigation (Lincoln, Neb., 1924), by Frank Covert Jean and John E. Weaver (page images at HathiTrust)
• Crop yields and climate change to the year 2000 : report on the second phase of a climate impact assessment (National Defense University :, 1980), by National Defense University. Research Directorate and United States Defense Advanced Research Projects Agency (page images at HathiTrust)
• Opportunities for energy savings in crop production report (U.S. Govt. Print. Off., 1978), by Library of Congress. Environment and Natural Resources Policy Division, Nancy L. Smith, and Development United States. Congress. House. Committee on Science and Technology. Subcommittee on Advanced Energy Technologies and Energy Conservation Research (page images at HathiTrust)
• Increasing world food output : problems and prospects (U.S. Dept. of Agriculture, Economic Research Service, Foreign Regional Analysis Division, 1965), by Lester Russell Brown (page images at HathiTrust)
• Rapid crop improvement using tissue culture technique : a new method for the production of stress tolerant, energy efficient crop plants (Office of Agriculture, Development Support Bureau, Agency for International Development, 1980), by Murray W. Nabors, Terrence Hardcastle, United States. Agency for International Development. Office of Agriculture, and Colorado State University. Dept. of Botany & Plant Pathology (page images at HathiTrust)
• Knowing and using these relationships can help you to make wise cropping decisions (USDA-NRCS :, 1995), by David C. Nielsen, Colorado Conservation Tillage Association, United States. Natural Resources Conservation Service, and United States. Central Great Plains Research Station (page images at HathiTrust)
• What yields from Wisconsin soils? (Madison, 1966), by University of Wisconsin. Extension Service (page images at HathiTrust; US access only)
• Outstate testing circular. (Agricultural Experiment Station, 1948), by University of Nebraska (Lincoln campus). Agricultural Experiment Station (page images at HathiTrust; US access only)
• Impact of climatic fluctuation on major North American food crops (The Institute of Ecology, 1976), by Institute of Ecology and Charles F. Kettering Foundation (page images at HathiTrust)
• Boletín mensual. (SAHR/DGEA, 1970), by Mexico. Dirección General de Economía Agrícola (page images at HathiTrust; US access only)
• Summarization of strip cropping data on crop yield, runoff and soil loss (U.S. Dept. of Agriculture, Soil Conservation Service, 1945), by James Henry Stallings (page images at HathiTrust)
• Review of terracing data on crop yield, runoff, and soil loss. (U. S. Soil Conservation Service, 1945), by James Henry Stallings (page images at HathiTrust)
• Effect of contour cultivation on crop yield, runoff, and erosion losses. (Soil Conservation Service, 1945), by James Henry Stallings (page images at HathiTrust)
• Soil analysis; a tool in crop production (Bridgeton, N. J., 1954), by Frank App and Vernon Ichisaka (page images at HathiTrust)
• Correlations between prices and yields of previous years. (1928), by Vladimir P. Timoshenko (page images at HathiTrust)
• Crop productivity--research imperatives : an international conference sponsored by Michigan State University, Agricultural Experiment Station, and The Charles F. Kettering Foundation, with the support of the National Science Foundation (RANN) ... [et al.], October 20-24, 1975 / organizers: M. Lamborg ... [et al.] ; editors: A. W. A. Brown ... [et al.]. (s.n., 1975?], 1975), by Harbor Springs International Conference on Crop Productivity--Research Imperatives, A. W. A. Brown, Michigan State University. Agricultural Experiment Station, and Charles F. Kettering Foundation (page images at HathiTrust; US access only)
• Sampling for objective yields of apples and peaches, Virginia, 1967-68 (Statistical Reporting Service, U.S. Dept. of Agriculture, 1971), by Fred B. Warren, William H. Wigton, and United States. Department of Agriculture. Statistical Reporting Service (page images at HathiTrust)
• Using corn plant vegetative characteristics to forecast production of grain per plant (U.S. Dept. of Agriculture, Statistical Reporting Service, 1971), by Frederic A. Vogel and United States. Department of Agriculture. Statistical Reporting Service (page images at HathiTrust)
• Interregional adjustments in crop and livestock production; a linear programming analysis (Economic Research Service, U.S. Dept. of Agriculture, 1968), by Ray F. Brokken, Earl O. Heady, and Iowa State University. Center for Agricultural and Economic Development (page images at HathiTrust; US access only)
• Day length and crop yields (U.S. Dept. of Agriculture, 1942), by M. W. Parker and H. A. Borthwick (page images at HathiTrust)
• Root behavior and crop yield under irrigation (Carnegie institution of Washington, 1924), by Frank Covert Jean and John E. Weaver (page images at HathiTrust)
• Biennial report of the Oregon Weather Bureau. (State Printer, 1891), by Oregon. State Weather Bureau (page images at HathiTrust)
• Losses in agriculture. (Agricultural Research Service, U.S. Dept. of Agriculture, 1965), by United States. Agricultural Research Service (page images at HathiTrust)
• The influence of relative area in intertilled and other classes of crops on crop yield (U.S. Dept. of Agriculture, Office of the Secretary, 1916), by D. A. Brodie (page images at HathiTrust)
• Analysis of data systems requirements for global crop production forecasting in the 1985 time frame (National Aeronautics and Space Administration, Scientific and Technical Information Office ;, 1978), by Sanford W. Downs, Paul A. Larsen, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (page images at HathiTrust)
• Estimation and imputation of crop yield advances by states and regions (Iowa Agriculture and Home Economics Experiment Station, Iowa State University of Science and Technology, 1968), by L. Auer and Earl Orel Heady (page images at HathiTrust; US access only)
• Transpiration as a factor in crop production (The University of Nebraska, 1916), by T. A. Kiesselbach (page images at HathiTrust)
• Depth of plowing and crop yields (Agronomy Dept., Agricultural Experiment Station, South Dakota State College, 1940), by A. N. Hume (page images at HathiTrust; US access only)
• Crop yields as related to depth of plowing (Agronomy Dept., Agricultural Experiment Station, South Dakota State College, 1943), by A. N. Hume (page images at HathiTrust; US access only)
• Initial soil moisture and crop yield (Oklahoma Agricultural and Mechanical College, Agricultural Experiment Station, 1929), by H. H. Finnell (page images at HathiTrust; US access only)
• Research to meet U.S. and world food needs : report of a Working Conference. (s.n., 1975), by Working Conference on Research to Meet U.S. and World Food Needs and Agricultural Research Policy Advisory Committee (page images at HathiTrust; US access only)
• Farm demonstration work in Maine and New Hampshire for the year 1915 (1915), by N.Y.) General Education Board (New York (page images at HathiTrust)
• Crop yields and prices, and our future food supply (Cornell University, 1914), by George F. Warren (page images at HathiTrust)
• The production of dry matter with different quantities of irrigation water (Utah Agricultural College Experiment Station, 1912), by John Andreas Widtsoe (page images at HathiTrust)
• The yields of crops with different quantities of irrigation water (Utah Agricultural College Experiment Station, 1912), by John Andreas Widtsoe and Lewis A. Merrill (page images at HathiTrust)
• Methods for increasing the crop producing power of irrigation water (Utah Agricultural College Experiment Station, 1912), by John Andreas Widtsoe and Lewis A. Merrill (page images at HathiTrust)
• The effect of irrigation on the growth and composition of plants at different periods of development (Utah Agricultural College Experiment Station, 1912), by John Andreas Widtsoe and Robert Stewart (page images at HathiTrust)
• Factors affecting the depth of sowing various crops (Utah Agricultural College Experiment Station, 1918), by Franklin Stewart Harris and J. Howard Maughan (page images at HathiTrust)
• Grass versus non-grass fed pigs ; Exercise versus non-exercise for pigs (Utah Agricultural College Experiment Station, 1893), by J. W. Sanborn and W. P. Cutter (page images at HathiTrust)
• Effect of cropping practices on yield, soil organic matter and erosion in the Pacific Northwest Wheat Region (Published cooperatively by the Agricultural Experiment Stations of Idaho, Oregon and Washington, and the Agricultural Research Service, U.S. Dept. of Agriculture, 1960), by Glenn M. Horner (page images at HathiTrust; US access only)
• The profits from the use of fertilizers. ([Ithaca, N. Y.], 1912), by J. E. Turlington (page images at HathiTrust)
• The relation between the chemical composition of the soil and its productivity (1916), by Oscar Edwin Harrington (page images at HathiTrust; US access only)
• Relationship to crop metabolism and water status to irrigation need (University of Illinois, Water Resources Center, 1975), by S. Jurgens, John S. Boyer, and R. R. Johnson (page images at HathiTrust; US access only)
• Productivity of Illinois soils (University of Illinois at Urbana-Champaign, College of Agriculture, Cooperative Extension Service, 1970), by R. T. Odell and W. R. Oschwald (page images at HathiTrust; US access only)
• Soils manual for the fourth farm credit district, with crop requirements supplement. (Farm Credit Administration, 1940), by G. W. Patteson, A. B. Beaumont, and United States Farm Credit Administration (page images at HathiTrust; US access only)
• Contribution of changes in yield to output and variability in trends for selected basic crops (Agricultural Experiment Stations, University of Georgia], 1975), by Joseph C. Purcell and J. C. Elrod (page images at HathiTrust; US access only)
• The relation between yields and prices (University of Illinois Agricultural Experiment Station, 1914), by E. Davenport and University of Illinois at Urbana-Champaign. Agricultural Experiment Station (page images at HathiTrust)
• Fifty years of dry land research at the Nephi Field Station (Utah Agricultural Experiment Station, 1954), by William Hunter Bennett (page images at HathiTrust; US access only)
• Business analysis of farms in Utah County, Utah (Utah Agricultural Experiment Station, 1939), by Walter U. Fuhriman and W. Preston Thomas (page images at HathiTrust; US access only)
• Fertilizer use and crop yields in the United States (U.S. Dept. of Agriculture, 1954), by National Soil and Fertilizer Research Committee (U.S.) (page images at HathiTrust)
• Changes in farm production and efficiency (Dept. of Agriculture, Economic Research Service, [National Economic Analysis Division], 1977), by United States. Department of Agriculture. Economic Research Service. National Economic Analysis Division and Evelyn T. Black (page images at HathiTrust)
• The economic position of fertilizer use in the United States (U.S. Dept. of Agriculture, Agricultural Research Service, 1958), by D. B. Ibach and R. C. Lindberg (page images at HathiTrust)
• Shelterbelt influence on Great Plains field environment and crops : a guide for determining design and orientation (U.S. Dept. of Agriculture, Forest Service, 1962), by J. H. Stoeckeler (page images at HathiTrust)
• Nineteen sixty-eight research on seed factors affecting the establishment of vegetable crop stands. (New York State Agricultural Experiment Station, Cornell University, 1968), by B. E. Clark, E. C. Waters, and D. B. Kline (page images at HathiTrust; US access only)
• Technicas de muestreo para la medicion y pronosticacion de los rendimientos de los cultivos (Dept. of Agriculture, Economics, Statistics, and Cooperatives Service, 1978), by Harold F Huddleston and Statistics United States. Dept. of Agriculture. Economics (page images at HathiTrust)
• Variability of wheat yields by counties in the United States (United States Department of Agriculture, Agricultural Economics, 1951), by E. Lloyd Barber and United States. Bureau of Agricultural Economics (page images at HathiTrust)
• Do sunspot cycles affect crop yields? (U.S. Dept. of Agriculture, Economic Research Service, 1976), by Virden L. Harrison and United States. Dept. of Agriculture. Economic Research Service (page images at HathiTrust)
• The World agricultural situation : review of 1965 and outlook for 1966. (U.S. Dept. of Agriculture, Economic Research Service, Foreign Agricultural Service, 1965) (page images at HathiTrust)
• Report of the Workshop on Experimental Designs for Predicting Crop Productivity with Environmental and Economic Inputs, held from May 20 to 24, 1974, at the University of Hawaii, Honolulu, Hawaii (Hawaii Agricultural Experiment Station, College of Tropical Agriculture, University of Hawaii, 1975), by James Anthony Silva, F. H. Beinroth, Hawaii Agricultural Experiment Station, University of Puerto Rico, University of Hawaii (Honolulu), United States. Agency for International Development, and Workshop on Experimental Designs for Predicting Crop Productivity with Environmental and Economic Inputs (1974 : University of Hawaii) (page images at HathiTrust; US access only)
• Measured crop performance (Agricultural Experiment Station, 1952), by H. L. Cooke, R. P. Moore, C. D. Peedin, and North Carolina Agricultural Experiment Station (page images at HathiTrust; US access only)
• Measured crop performance (Agricultural Experiment Station, 1951), by H. L. Cooke, R. P. Moore, C. D. Peedin, and North Carolina Agricultural Experiment Station (page images at HathiTrust; US access only)
• Soil and water conservation (United States Government Printing Office, 1952), by United States. Soil Conservation Service and United States Department of Agriculture (page images at HathiTrust)

More items available under broader and related terms at left.