00606naa a2200205 a 450000100080000000500110000800800410001910000160006024501500007626000090022665000130023565000100024865000160025865000220027465000130029665300100030965300080031970000170032777300560034416088191995-06-27       1991    bl uuuu     u00u1 u    #d1 aHARDTER, R.  aNitrogen and phosphorus use in maize sole cropping and maize/cowpea mixed cropping systems on an alfisol in the northern Guinea Savanna of Ghana.  c1991  aFósforo  aMilho  aNitrogênio  aVigna Unguiculata  aZea Mays  aCaupi  aFBN1 aHORST, W. J.  tBiol. Fertil. Soilsgv. 10, n. 4, p. 267-275, 1991.