00671naa a2200229 a 450000100080000000500110000800800410001910000160006024501190007626000090019565300200020465300170022465300150024165300100025670000210026670000190028770000160030670000160032270000140033870000150035277300740036710033882004-10-13       2004    bl uuuu     u00u1 u    #d1 aALVAREZ, R.  aThe balance sheet method as a conceptual framework for nitrogen fertilization of wheat in a pampean agroecosystem.  c2004  aAgroecossistema  aFertilizacao  aNitrogenio  aTrigo1 aSTEINBACH, H. S.1 aGRIGERA, S. M.1 aCARTIER, E.1 aOBREGON, G.1 aTORRI, S.1 aGARCIA, R.  tAgronomy Journal, Madisongv. 96, n. 4, p. 1050-1057, july/aug. 2004.