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

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.

Key Words: corn ¹⁵N • isotopic fractionation • soybean ¹⁵N • symbiotically fixed N

¹ Contribution from the Dep. of Agronomy, Univ. of Illinois, and the Illinois Agric. Exp. Sta., Urbana, IL 61801. Presented before Div. S-4, Soil Science Society of America meetings, 27 Aug. 1975, Knoxville, Tenn. The work is part of the Ph.D. thesis of the senior author.

² Former Research Assistant, Agronomist, and Professor, respectively, Univ. of Illinois. The senior author is now Assistant Professor, Montana State University, Bozeman, MT 59715.

Received for publication January 31, 1975.