Some corn showed no response to sulfur and some did. Locations that were more responsive showed yield increases ranging from a few bushels to more than 50 bu./acre compared to the untreated. Research is not complete but there was visual evidence that sulfur applications were achieving a response. Soil sulfur levels or supply may be diminishing due to several factors. At the same time less incidental sulfur is being applied or deposited, there is greater removal of sulfur by increasing crop yields. Due to these factors, there is a need to further investigate sulfur fertilization for corn in Illinois. This study will produce valuable information regarding the frequency of sulfur deficiency that Illinois can expect, and most important, identify the most likely regions or conditions under which sulfur deficiencies can occur in the state.