Forty pounds of S per acre applied as elemental S sup- plied sufficient S for annual grassland forage needs for 2 years. The same amount of S as gypsumwas sufficient for only 1 year. Where elemental S was applied, more forage was, produced the second, third, and fourth seasons after application than where gypsum was used. Uptake of S by the crop showed similar differences between elemental S and gypsum.  Most of the benefits derived from fertilizing with S were derived from increased productivity of subclover and indirectly from nitrogen supplied to associated grasses.  The efficiency of the applied gypsum and elemental S varied from 13 to 34%.  The data indicates maximum forage production requires an annual application of gypsum or biennial application of elemental sulfur.

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