1. The Use of the Nitrogen Isotope N15 in Field Studies with Oats
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4. Broadbent, F. E., and Clark, F. E., in “Soil Nitrogen,” Am. Soc. Agron. No. 10, pp. 344–359, Madison, Wisconsin, 1965.
5. Nitrogen-15-Depleted versus Nitrogen-15-Enriched Ammonium Sulfate as Tracers in Nitrogen Uptake Studies