Commercial soybean (Glycine max L.) production requires less N
input than non-leguminous crops due to the plant’s ability to
obtain biologically
fixed N via a symbiotic relationship with
Bradyrhizobium japonicum (Bradyrhizobiaceae), a bacterial species
in a group of N-fixing taxa associated with legumes collectively
referred to as rhizobia (van Rhijn and Vanderleyden, 1995). The
bacteria are located within root nodules and convert atmospheric
N2 into nitrogenous compounds called ureides (Schubert, 1986). In
general, ureide N is correlated with N-fixation (van Berkum et al.,
1985; Schubert, 1986). Several factors can impact the strength
of rhizobial-plant associations and subsequent nodulation and
N-fixation rates, most notably soil N (e.g., nitrate) levels (Streeter
and Wong, 1988). When a soil contains adequate N, either from
organic matter or synthetic fertilizer, a plant will use these sources
before associating with rhizobia
Commercial soybean (Glycine max L.) production requires less N
input than non-leguminous crops due to the plant’s ability to
obtain biologically
fixed N via a symbiotic relationship with
Bradyrhizobium japonicum (Bradyrhizobiaceae), a bacterial species
in a group of N-fixing taxa associated with legumes collectively
referred to as rhizobia (van Rhijn and Vanderleyden, 1995). The
bacteria are located within root nodules and convert atmospheric
N2 into nitrogenous compounds called ureides (Schubert, 1986). In
general, ureide N is correlated with N-fixation (van Berkum et al.,
1985; Schubert, 1986). Several factors can impact the strength
of rhizobial-plant associations and subsequent nodulation and
N-fixation rates, most notably soil N (e.g., nitrate) levels (Streeter
and Wong, 1988). When a soil contains adequate N, either from
organic matter or synthetic fertilizer, a plant will use these sources
before associating with rhizobia
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