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Figure 1. Average U.S. (1865–2005) and Canadian (1892–2005) maize yields in kilograms per hectare (15.5% moisture), 1866 to 1938 (pre-hybrid era; – US yields, – Canadian yields), 1939 to 2005 (hybrid era; – US yields, – Canadian yields). Data compiled by the USDA and Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA).

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