00630naa a2200217 a 450000100080000000500110000800800410001910000170006024501320007726000090020965000240021865000110024265000160025365000130026965000250028265000100030770000180031770000180033570000160035377300430036916194191995-06-27       1991    bl ---       0--  u    #d1 aDALAL, R. C.  aSustaining multiple production systems. 2. Soil fertility decline and restoration of cropping lands in sub-tropical Queensland.  c1991  aFertilidade do Solo  aManejo  aNitrogênio  aPastagem  aRotação de Cultura  aTrigo1 aSTRONG, W. M.1 aWESTON, E. J.1 aGAFFNEY, J.  tTrop. Grassld.gv.25, p.173-180, 1991.