Corn yield has been less variable during the past 12 years than the previous 20. However, the yield of the past 5 years in Iowa exceeded trend. The national yield has a run of 5 above-trend years; this is an historical record. A run of 4 above trend years occurred in 1984-87 (with a major drought at each end).
Iowa State University
Taylor, S. Elwynn, "Weather Situation and Outlook for 2008" (2008). Integrated Crop Management News. 950.
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