Farmers across northern Iowa spent last week patching in soybeans — or in some cases replanting entire fields — after a Memorial Day weekend frost zapped emerging corn and soybean plants.

“The frost damage was more severe in high-residue, no-till or cover crop fields, and obviously in low areas of the field or along field edges in some places,” said Angie Rieck-Hinz, Iowa State University (ISU) field agronomist in north central Iowa. “It’s really patchy. The more residue coverage you had out there, the more you got...