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Wait to plant until the soil temperature is right. In general, corn should be planted when soil temperatures are near 50 Â°F. Seed will absorb about 30 percent of its weight in water, and temperature does not affect water imbibition much.ait to plant until the soil temperature is right. In general, corn should be planted when soil temperatures are near 50 Â°F. Seed will absorb about 30 percent of its weight in water, and temperature does not affect water imbibition much.
Maps of Optimum Soil Temperatures for Planting Figure 1 shows the general distribution of when soil temperatures first reach a minimum temperature each season, based on average soil temperatures over the last 10 years. For example, much of the state reaches the 55Â°F soil temperature during the first to third week of April. Since field corn requires a minimum soil temperature of 55Ã¢ Â°F to germinate, the average earliest time to plant field corn would be in the second or third week of April. For other crops use Table 1 to determine the minimum soil temperatures required for germination and use Figure 1 to view the average time when a location reaches a given temperature. It is important to understand that the soil temperature maps in Figure 1 provide an average trend using data from the last 10 years to provide generalized results.