Our current remarkable stretch of frozen weather has cooled Iowa soils to freezing very quickly! The featured chart presents the four inch depth soil temperature climatology based on 25 years of ISU Ag Climate station data for Ames. The red line represents the daily values for this year. You can see the quick drop in temperatures this November as we went from warmer than average to colder than average in just a few days. The implication is that there was limited time range for fall nitrogen application and little chance for planted cover crops to get established this year due to the late harvest.

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