From a cold and extremely wet spring, to snow in May and the currently developing drought, the corn crop has had no shortage of stress thrown at it this year. While the recent period has been dry, it has also been cool during an important period in corn development after tasseling. The featured chart assumes that the corn crop was planted on 1 May each year and then plots the number of days between the VT and R2 corn development stage based on growing degree days. The bars are then colored based on whether the Story County (Ames) corn yield that year was above or below the trend line. Obviously, one metric is not a perfect predictor of yield, but it does appear having a longer period helps yield.

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Tags:   corn