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Climodat information from mesonet.agron.iastate.edu. Figure 2. If the soil temperature is averaging 50 to 55 F (10-12.8 C) at the time of planting, corn may take three weeks to emerge. Temperatures averaging 60 F (15.6 C), may have emergence in 10 days to 12 days. Soybean emergence usually requires that soils be about 10 degrees warmer than for corn although soybean does begin to respond at 50 F. Data from Elwynn Taylor, Iowa State University.
It may take several days of air temperatures in the 60 to 90 F range to warm soil to 60 F in the spring. If your corn is slow to germinate, you may have planted it before the soil was warm enough. At a soil temperature of 55 F, corn may take up to 22 days to germinate. Moisture In order to sprout quickly, corn seed needs adequate moisture in the soil, which kicks off the germination process.