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This article in JEQ

  1. Vol. 4 No. 4, p. 486-490
     
    Received: Jan 31, 1975


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doi:10.2134/jeq1975.00472425000400040013x

Natural 15N Abundance in Soil, Leaves, and Grain as Influenced by Long Term Additions of Fertilizer N at Several Rates1

  1. V. W. Meints,
  2. L. V. Boone and
  3. L. T. Kurtz2

Abstract

Abstract

Soil, leaf, and grain natural 15N abundance was measured in corn (Zea mays L.) and soybean (Glycine max L.) plots which had received various rates of fertilizer N for 20 years. Soil 15N abundance did not significantly reflect the amount of fertilizer N applied and should not be used to estimate fertilizer N additions. Corn leaf and grain 15N abundance reflected additions of fertilizer N only at low rates of fertilizer N applied. Soybean leaf 15N abundance reflected a decrease in symbiotic N fixation with additional increments of fertilizer N applied.

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