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Absorption and Translocation of Foliarly Applied ¹⁸N by Soybeans¹

Nitrogen nutrition of soybeans (Glycine max) is important in determining their yield potential. Labelling of leaves with ¹⁵N by foliar fertilization provides an effective method for determining mobilization and partitioning of N from leaves to other plant parts. The purpose of this field research was to develop a method that would be useful in measuring the efficiency of N absorption and translocation by leaves. Labelled urea was foliarly applied at V5-V6, V7-V8, and V10-V12 growth stages while labelled (NH₄)₂SO₄ was applied only at V5-V6 growth stage. The N solutions were applied to a single trifoliolate leaf on each plant. A micropipette was used to apply droplets directly to leaves held stationary and horizontal by taping them to a stand. Average N uptake, into the plant, 18 h after application was 71% of that applied. No significant differences in translocation between N sources or growth stages was found.

² Research associate and professor, respectively, Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843.

Received for publication September 13, 1982.

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