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Absorption and Translocation of Foliarly Applied 15 N by Soybeans 1
Author(s) -
Morris D. R.,
Weaver R. W.
Publication year - 1983
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1983.00021962007500030036x
Subject(s) - chromosomal translocation , absorption (acoustics) , nitrogen , plant growth , chemistry , urea , yield (engineering) , glycine , botany , agronomy , biology , physics , biochemistry , organic chemistry , acoustics , gene , amino acid , thermodynamics
Nitrogen nutrition of soybeans ( Glycine max ) is important in determining their yield potential. Labelling of leaves with 15 N 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 (NH 4 ) 2 SO 4 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, 15 h after application was 71% of that applied. No significant differences in translocation between N sources or growth stages was found.