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Published online 1 January 1968
Published in Agron J 60:20-23 (1968)
© 1968 American Society of Agronomy
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Sulfur Content and Yield of Alfalfa in Relation to Plant Nitrogen and Sulfur Fertilization1

R. C. Sorensen, E. J. Penas and U. U. Alexander2

Nitrogen and S percentages or yields or all of these were determined for alfalfa grown in two areas of Nebraska where soil and environmental conditions are markedly different. The much higher critical concentrations of S found in forage grown on sandy soils of northeast Nebraska than the commonly accepted value of 0.22% were attributed to effects of drouth. N and S contents were closely related in alfalfa grown with and without applied S both on drouthy sandy soils and on a highly fertile soil with natural subirrigation. The curve relating N and S percentages in alfalfa grown on soils where S was applied was essentially parallel to that for soils where S deficiency was not a problem. N concentrations increased with yield increase to applied S.

Key Words: protein

1 Published with the approval of the Director as paper No. 2073, Journal Series, Nebraska Agricultural Experiment Station. The research was supported in part by The Sulphur Institute, Washington, D. C., and Tennessee Valley Authority, Muscle Shoals, Ala.

2 Assistant Professor and Assistant Extension Agriculturist, Department of Agronomy; and Associate Extension Agriculturist, Northeast Exp. Sta., Univ. of Nebraska, respectively.

Received for publication April 26, 1967.




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Copyright © 1968 by the American Society of Agronomy.