Soil temperature is important in all seasons, but especially so in the spring as crop emergence takes center stage. Corn seed planted in soil at 50 degrees F requires about 21 days to emerge. Only seven days elapse from planting to emergence when the soil temperature is 70 degrees.
Iowa State University
Taylor, S. Elwynn, "Take Note of Soil Temperature" (2009). Integrated Crop Management News. 702.
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