Updated January 2015. The increased cost of health insurance is a central fact in any discussion of health policy and health delivery. As annual premiums edged beyond $16,800 for an average family, costs are blamed for rising uninsured and under-insurance..
Figure 1. Corn growth and temperature levels. Corn will germinate and grow slowly at about 50 F (10 C), but the average first spring planting dates across the U.S. usually begin when the average air temperatures reach 55 F (13 C) and soil temperature at seed depth is favorable for seedling growth.
Data from other scientists and Iowa planting date studies â suggests to plant corn after mid-April when soil temperatures are near 50 degrees Fahrenheit to maximize yield. Seed absorbs about 30 percent of its weight in water; temperature does not affect that process.