Losses of 15N-nitrogen by plant–soil system after herbicide application on black oat - Damin, Virginia; Trivelin, Paulo Cesar Ocheuze; Moraes, L. A. C; Bruno, Isabeli Pereira; Figueiredo, L. A; Lima, A. B; Genuário, Diego Bonaldo (Acta Agriculturae Scandinavica, Section B, 2017)