Gypsum and Elemental Sulfur as Fertilizers on Annual Grassland1

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Abstract
Gypsum and elemental S, each fine enough to pass through a 100‐mesh screen, were applied at equivalent rates in each of 4 years to soils deficient in S. Forage yields, percent clover, total S uptake, and concentration of S in the plants were recorded over a 5‐year period. The two sources of S were equally effective in increasing yield, S uptake and concentration in the forage, and percentage of clover in the stand the first season after application. However, more S from gypsum than from elemental S was taken up during the winter of the first year, while the reverse was true for the following spring. In the second season after treatment, forage production from elemental S approximated that of the first year; however, yields from gypsum were significantly less than in the first year. In subsequent years forage production declined until there was no significant effect from gypsum in the fourth season nor from elemental S in the fifth season. A significant increase in S uptake and percent S in the forage from gypsum was measured the second year; however, with elemental S a significant increase in S uptake persisted through the third year. Percentage clover declined rapidly with each additional year following application with the decline more rapid where gypsum was applied. Efficiency of the S applied varied from 13 to 34%.

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