00481naa a2200157 a 450000100080000000500110000800800410001910000170006024501260007726000090020365000260021265000120023865300080025065300120025877300530027016058411995-06-27       1985    bl ---       0--  u    #d1 aCHALK, P. M.  aEstimation of N2 fixation by isotope dilutionbAn appraisal of techniques involving 15N enrichment and their application.  c1985  aDiluição Isotópica  aMétodo  a15N  aREVISAO  tSoil Biol. Biochem.gv.17, n.4, p.389-410, 1985.