<b>Rapid quantification of biological nitrogen fixation using optical spectroscop</b><b>y</b>

Raw isotope data, scanned spectra, and model prediction data for two cases. The first case was conducted at the glasshouse while the second one was at the field. For data from the Glasshouse experiment, data were saved as Glasshouse_isotope_Spectra.Rdata. For data from the field experiment, data were saved as Field_isotope_Spectra.Rdata. Each Rdata file contained raw isotope data, scanned spectra, and predicted isotope data for two species, Luc and Fes. Luc indicates the legume species Lucerne (Medicago Sativa). Fes indicates the non-legume species tall Fescue (Festuca arundinacea). Data should be linked with paper (Rapid quantification of biological nitrogen fixation using optical spectroscopy. doi: 10.1093/jxb/erad426.)