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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.
Fig. 2. Example of the effect of soil temperature on the timing of corn emergence. Adequate and uniform seed-to-soil contact. In order for the kernel to imbibe (absorb) soil moisture quickly and uniformly, good seed-to-soil contact is vital.he good news is that there are only four simple requirements for uniform germination and emergence of corn. The bad news is that one or more of the requirements are sometimes absent in one field or another.