Centre county Pennsylvania, USA | As mjl has posted, USDA reports that MN's highest corn yield was 177 bu/acre, harvested in 2010. USDA also reports that MN's 2014 corn yield was 156 bu/acre. MN corn yield for 2015, projected from MN's 45 year corn yield trend, is 173.5 bu/acre (chart).
 (MN_grain_corn_yield_by_year.png)
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 MN_grain_corn_yield_by_year.png (55KB - 60 downloads)
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My MN yield guess is 182
