Measurement of Nitrogen Fixation by Soybean in the Field Using the Ureide and Natural 15N Abundance Methods

Nitrogen fixation by field-grown soybean (Glycine max [L.] Merrill) was assessed by the natural (15)N abundance and ureide methods. The field sites (five) and genotypes (six, plus two levels of inoculation on Bragg) were chosen to provide a range of proportions of plant N derived from nitrogen fixat... View More