Isotopic 15N signature of grass-alone and grass-legume tropical pastures to estimate sources of nitrogen to grasses in farmer managed pastures - Villegas, Daniel Mauricio; Velásquez, Jaime E.; Arango, Jacobo; Obregon, Karen; Rao, Idupulapati M.; Rosas, Gelber; Oberson, Astrid (Bioversity International and the International Center for Tropical Agriculture, 2021)