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This article in SSSAJ

  1. Vol. 38 No. 2, p. 266-267
    Received: May 11, 1973
    Accepted: Dec 18, 1973

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

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



(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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