The application of hog manure resulted in significant increases in soil fertility, soil structure and crop production; and when applied at a rate of 8,000 gallons per acre , these effects lasted into the second year. The inclusion of elemental sulphur resulted in the greatest increase in crop production on a sulphur-deficient soil at Star City. However, at the other sites the sulphur appeared to decrease the effectiveness of the hog manure. Our research indicates that the acidification process of S-mineralization may negatively affect N-mineralization.