Randy, I would suggest keeping a small grain in your rotation———either spring wheat, spring barley or oats. Historically oats and wheat have performed better in southern Iowa than barley. Check potential markets for these two crops before going ahead. Time is short to get those planted———-they should, ideally have been planted by April 15. You are a bit late to achieve the highest possible yields, but certainly okay to go ahead with these alternatives A nice advantage to the spring-planted small grains is your ability to plant your underseeding cover crop with the oats or wheat. One pass and it’s done! Either species should work fine in your rotation. I assume that you will be planning to grow corn corn again in 2017?