Potatoes are less responsive to sulfur than many other crops.
January 1996 Maurice L. Vitosh and Lee W. Jacobs Extension Soil Specialists Department of Crop and Soil Sciences Michigan State University Soil testing is one of the best tools we have for obtaining an inventory of the nutrients that the soil can supply. One of the keys to a good soil testing program is proper soil sampling. Fertilizer, manure additions and nutrient removal by crops will alter the soil test, so each field should be tested every two to three years. For high value crops or fields where large amounts of fertilizer are added, retesting every year is desirable. Once we have determined what the soil can supply, we can better determine whether the crop needs supplemental nutrients.