ISU crop specialist: soybean to soybean OK Posted By: Ben Butler May 18, 2009 @ 4:50 am Today's Local News Tweet Share Email Last spring's flooding and wet weather forced many Southeast Iowa farmers to plant soybeans, where they had hoped to plant corn. Iowa State University Crop Specialist Palle Peterson says while planting that ground to soybeans again isn't desirable, it shouldn't pose a major problem. Peterson says the yield loss should be less than 5% as compared with a regular crop rotation.