00491naa a2200181 a 450000100080000000500110000800800410001910000170006024500910007726000090016865000120017765000120018965000160020165000070021765000140022470000200023877300510025816120951995-06-27       1989    bl uuuu     u00u1 u    #d1 aHENRY, L. T.  aEffects of root-zone acidity on utilization of nitrate and ammonium in tobacco plants.  c1989  aAmônia  aNitrato  aNitrogênio  aPh  aRizosfera1 aRAPER JR, C. D.  tJ. Plant Nutr.gv. 12, n. 7, p. 811-826, 1989.