Experts are encouraging farmers in drought-stressed areas to have their soil tested and consider delaying or spreading out fertilizer applications. 

Based on research, there are clearly areas of Iowa that have large amounts of fall residual nitrogen in the soil due to this summer’s drought, said Iowa State University (ISU) professor of agronomy Michael Castellano. 

“We know that during a drought year, the soil retains more nitrogen for a number of reasons,” he said. “Not only does the crop utilize ...