ASSESSMENT OF NEEDED INCREASES IN NITROGEN USE EFFICIENCIES TO MEET CROP PRODUCTION AND ENVIRONMENTAL GOALS AT CONTINENTAL SCALE


Wim de Vries1, Hans Kros1 and Lena Schulte-Uebbing2, (1)Wageningen University and Research Center, Wageningen, Netherlands, (2)Wageningen University and Research Center, Environmental Systems Analysis Group, Wageningen, Netherlands