00444naa a2200169 a 450000100080000000500110000800800410001910000180006024500890007826000090016765000120017665000120018865000070020065000090020770000170021677300410023316139171995-06-27       1986    bl ---       0--  u    #d1 aMACKAY, A. D.  aEffect of phosphate, calcium, and pH on the dissolution of a phosphate rock in soil.  c1986  aCálcio  aFosfato  aPh  aSolo1 aSYERS, J. K.  tFertil. Res.gv.10, p.175-184, 1986.