Yields on many Illinois farms in 2003 can be summarized using six words: excellent corn yields, poor soybean yields. In this article, we compare 2003 corn and soybean yields to historical yields. This examination indicates that it is unusual to have an above average corn yield in the same year as a below average soybean yield. However, this examination does not suggest that the long-term relationship between corn and soybean yields has changed.
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