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This report presents crop yield estimates for corn, soybeans, oats, and hay on 290 selected soil types and phases. These yield estimates are believed attainable as a 5-year average with the technology available in 1971 and average weather conditions.
Iowa State University. Agricultural and Home Economics Experiment Station
Agronomy and Crop Sciences | Soil Science
Fenton, T. E.; Duncan, E. R.; Shrader, W. D.; and Shrader, L. C., "Productivity levels of some Iowa soils" (1971). Special Report. 70.