Stephen,

Good observation, I have planted corn mixed with soybeans in the past.  However, after digging deep in the available research I have found that rotating corn and soybeans instead of mixing them provides better results.  Two of the primary reasons are parasites and disease.  In particular, whenever a crop, say corn, is planted in a food plot year after year the parasites and disease that accompany corn start to build up to a point that they begin to negatively affect yield.  By doing a rotation and planting soybeans instead of corn on some years the corn specific parasites and disease levels quickly fall off.  After a year or two the corn can then be replanted in the food plot with little loss in yield due to these factors.

At minimum, it’s best to split the field and plant half in corn and the other half in soybeans, then rotate the location of each crop the following year.

Growing Deer together,

Grant