Corn planting proceeded at an all-time record this spring. We’ve experienced one of the best planting seasons ever in Iowa. According to the most recentUSDA-NASS report (2 May 2010), 84 percent of Iowa’s corn was planted with cropping districts ranging from 69 percent complete in south central Iowa to 92 percent complete in north central Iowa. Overall, corn has been planted within the recommended window which should serve to maximize yield potential relative to planting date.
Iowa State University
Elmore, Roger and Abendroth, Lori, "Temperature Fluctuations Have and May Continue to Inhibit Corn Emergence" (2010). Integrated Crop Management News. 451.