Fig. 8 Yields reported by the top two winners in national (U.S.) or state (IA, KS, & MO) soybean yield competitions, and by researchers R. Flannery and R. Cooper on the basis of their yield-maximization research. Yields are plotted versus year of occurrence. For comparative purposes, the state yield averages for Nebraska's irrigated and rainfed soybean production are shown at the bottom of the chart, as is the U.S. soybean yield average

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