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Sulfur Uptake by Corn as Influenced by Ammonium and Nitrate Nitrogen¹

ABSTRACT

The effect of NH₄ and NO₃ ions on S uptake by corn (Zea mays L.) from a starter fertilizer was studied with the use of ¹⁵N and ³⁵S. When both the N and S were applied as a starter, the uptake of fertilizer S was significantly increased when NH₄ instead of NO₃ was used as the N source. This effect was observed in young plants through 4 weeks of age. More N was absorbed by the corn plant when NH₄ rather than NO₃ was supplied as the N source. The N source, however, had no significant effect on the total S, SO₄-S or total N content of the tissue and the corn yield.

¹ Paper no. 6996 Scientific Journal Series, Minnesota Agr. Exp. Sta., Univ. of Minn. St. Paul 55101. This study was supported in part by grants from The Sulphur Institute and The Tennessee Valley Authority.

² Formerly Teaching Assistant, now Area Extension Agronomist, Northeast Station Univ. of Neb., Concord, Nebr. and Professor of Soil Science, respectively.

Received for publication July 29, 1969. Accepted for publication September 11, 1969.