HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Starr, J. L. Articles by Stout, P. R. Search for Related Content PubMed Articles by Starr, J. L. Articles by Stout, P. R. Agricola Articles by Starr, J. L. Articles by Stout, P. R.

A Comparison of ¹⁵N-Depleted and ¹⁵N-Enriched Fertilizers as Tracers¹

ABSTRACT

(¹⁴NH₄)₂SO₄ from which virtually all ¹⁵N had been removed was compared as a tracer with (NH₄)₂SO₄ containing 8.95% ¹⁵N excess in a plant uptake experiment using soil columns maintained at bar tension and conventional greenhouse pots. Uptake of fertilizer nitrogen in three cuttings of ryegrass (Lolium Perenne L.) was identical with the two fertilizers.

Estimates of residual fertilizer N in the pots agreed less closely, owing to the high dilution factor.

¹ Contribution from the Dep. of Soils and Plant Nutrition, Univ. of California, Davis. This work was supported by NSF Grant GI-34733.

² Presently Postgraduate Research Soil Scientist, Professor of Soil Microbiology, and Professor of Soil Science, respectively.

Received for publication May 11, 1973. Accepted for publication December 18, 1973.