00510naa a2200157 a 450000100080000000500110000800800410001910000170006024501420007726000090021965000140022865000200024265000210026270000180028377300510030116119971995-06-27       1980    bl ---       0--  u    #d1 aDIRKS, V. A.  aRegression analyses of grain yield of corn, level of leaf N P K and soil conditions in a long-time rotation experiment on brookston clay.  c1980  aAgronomia  aFísica do Solo  aQuímica do Solo1 aBOLTON, E. F.  tCan. J. Soil Sci.gv.60, n.4, p.599-611, 1980.