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Not sure, I know mine was mostly a water issue. Corn being such a water heavy crop, it needs to be well watered for cob development I have been told. As I mentioned we had a horrible drought in Saskatchewan this year (yet also flooding in some areas). few farms only got 1 or 2 cuts this year, and now it saddens me to see that people are having to give up some livestock because they won't have enough feed to get through the winter.