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This article in SSSAJ

  1. Vol. 38 No. 2, p. 266-267
     
    Received: May 11, 1973
    Published: Mar, 1974


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doi:10.2136/sssaj1974.03615995003800020019x

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

  1. J. L. Starr,
  2. F. E. Broadbent and
  3. P. R. Stout2

Abstract

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 ⅓ 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.

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