00841nam a2200181 a 450000100080000000500110000800800410001910000210006024501250008126003260020665000150053265300140054765300280056170000170058970000170060670000190062370000170064219950832014-10-30       2014    bl uuuu     u00u1 u    #d1 aINACIO, C. de T.  aNitrogen isotopic composition of n-sources, vegetables and soil from two organic farming systems.h[electronic resource]  aIn: NITROGEN WORKSHOP: THE NITROGEN CHALLENGE: BUILDING A BLUEPRINT FOR NITROGEN USE EFFICIENCY AND FOOD SECURITY, 18., 2014, Lisboa. Resumo... Lisboa: Instituto Superior de Agronomia, CEER: Biosystens Engineering; Évora: Nacional de Ivestigação Agrícola e Veterinária; Viena: International Nitrogen Initiativec2014  avegetables  aN-sources  aOrganic farmins systems1 aURQUIAGA, S.1 aCHALK, P. M.1 aMATA, M. G. F.1 aSOUZA, P. O.