00528naa a2200157 a 450000100080000000500110000800800410001910000180006024501650007826000090024365000120025265000160026465000210028070000190030177300500032016012471995-06-27       1966    bl ---       0--  u    #d1 aKEENEY, D. R.  aDetermination and isotope-ratio analysis of different forms of nitrogen in soilsb4. Exchangeable ammonium, nitrate, and nitrite by direct-distillation methods.  c1966  aMétodo  aNitrogênio  aQuímica do Solo1 aBREMNER, J. M.  tSoil Sci. Amer. Proc.gv.30, p.583-587, 1966.