Beans are less efficient at fixing nitrogen (N) than other legumes. Sulfur (S) fertilization can impact their ability to fix and utilize N. This study aimed to determine the response of kidney beans to N and S and their combination as supplied in ammonium sulfate (AS). On a very sandy site with low organic matter, beans grown in 2002 with N fertilizer (with or without S) produced 36% higher yields than those without. Yields did not differ whether the source was urea alone, with AS, or with elemental S, but manganese (Mn) in leaf tissue was 30% higher when AS was included, compared to all other treatments. The highest N and S rate, 70 and 40 lb/A, respectively, supplied by AS and urea, produced the highest yield, 17 cwt/A.