This year soybean was planted late or replanted in many fields due to excess rainfall and late spring temperatures were colder than normal. Therefore, some producers wonder if foliar fertilization could help improve soybean growth and grain yield. The short answer is that it may, but probably not in fields that have been well fertilized or where growth is limited by factors other than nutrient supply. This short article reviews major issues involved, provides a brief summary of many studies conducted in Iowa during the last few years, and provides some recommendations.