The response to a sulfur (S) application of 28.5 pounds per acre in combination with 25, 50, and 75 pounds per acre (28, 56, 84 kg/ha) nitrogen (N) applied annually to an established stand of Nordan crested wheatgrass was compared with that receiving the same rates of N only. In the forst growing season mean herbage N:S ratios of 8:1 were maintained under all levels of N fertilization with S present; however, in its absence, N:S ratios ranged from 9:1 in the controls to 15:1 in plants fertilizedwith 75 pounds per acre (84 kg/ha) N. Yield of herbage, herbage N, and herbage S was increased with N fertilization in the subsequent six years but with S also present further and significant (P<0,05) increases were measured during the second, third, and fourth growing seasons following the initial application. Soil S increases in the upper 10 inches (25 cm) due to S additions were evident only in the first growing season. These results suggest that crested wheatgrass under N fertilization programs may suffer from S deficiencies which can be corrected with periodic applications of S.
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