The source of N used by soybeans (from fertilization or N-fixation)
can impact the identity and concentration of nitrogenous com-
pounds within plant tissues (Pate, 1980; McNeil and LaRue, 1984),
with the total N within xylem sap of nodulated soybeans consisting
of60–95%ureides(McClureandIsrael,1979).Theothermajorformof
N translocated from roots to the shoots is asparagine (ASN), which is
an amino acid present within the xylem, regardless of whether the
plants obtain N from N-fixation or fertilizer, although more of this
amino acid results from the latter scenario
The source of N used by soybeans (from fertilization or N-fixation)can impact the identity and concentration of nitrogenous com-pounds within plant tissues (Pate, 1980; McNeil and LaRue, 1984),with the total N within xylem sap of nodulated soybeans consistingof60–95%ureides(McClureandIsrael,1979).TheothermajorformofN translocated from roots to the shoots is asparagine (ASN), which isan amino acid present within the xylem, regardless of whether theplants obtain N from N-fixation or fertilizer, although more of thisamino acid results from the latter scenario
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