00852naa a2200253 a 450000100080000000500110000800800410001910000190006024501460007926000090022552000590023465000270029365000120032065000190033265000130035165300260036465300220039065300240041265300270043665300290046365300250049270000210051777300600053810753811995-11-24       1981    bl ---       0--  u    #d1 aPOWLSON, D. S.  aA comparison of the organic matter, biomass, adenosine thiphosphate and mineralizable nitrogen contents of ploughed and direct-drilled soils.  c1981  aIntroduction;materials and methods;results;discussion.  aadenosine triphosphate  abiomass  aorganic matter  aBiomassa  aBiomassa microbiana-C  aMaterial organica  aMicrobial biomass-C  aNitrogen mineralizable  aNitrogenio mineralizavel  aTrifosfato adenosina1 aJENKINSON, D. S.  tJournal of Agricultural Sciencegv.97, p.713-721, 1981.