01917naa a2200325 a 450000100080000000500110000800800410001910000200006024501130008026000090019330000150020250001380021752007550035565000110111065000160112165000220113765000130115965000170117265000120118965000190120165000210122065000120124165000120125365000290126565000140129465000130130865300110132170000220133277302370135415542741998-06-08       1997    bl uuuu     u00u1 u    #d1 aSIQUEIRA, J. O.  aMicrobial populations and activities in highly-weathered acidic soilsbhighlights of the Brazilian research.  c1997  ap.139-156.  aTrabalho apresentado no "Fourth International Symposium on Plant-Soil Interactions at low pH, Belo Horizonte, MG, Brazil, Mar. 1996".  aAcidic, highly-weathered soils cover about two-thirds of tropical America and are of great ecological and economical importance. Soil acidity is the major constraint for agriculture production on these soils, as it affects crop productivity, soil function and microbial ecology. It determines type, number and activity of soil microorganism, thus affecting soil biological processes. Acidity-microbial interactions in soil are very complex and soil microorganisms can be largely adapted to this type of stress. However, liming acidic soils enhances microbial processes related to soil organic matter decomposition, nutrient transformation and cycling and root-microbial symbioses; all with an immediate impact on crop productivity and sustainability.  aBrazil  amycorrhizae  anitrogen fixation  aresearch  asoil biology  asoil pH  aAcidez do Solo  aBiologia do Solo  aCalagem  aCerrado  aFixação de Nitrogênio  aMicorriza  aPesquisa  aBrasil1 aMOREIRA, F. M. S.  tIn: MONIZ, A.C.; FURLANI, A.M.C.; SCHAFFERT, R.E.; FAGERIA, N.K.; ROSOLEM, C.A.; CANTARELLA, H., ed. Plant-soil interactions at low pH: sustainable agriculture and forestry production. Campinas: Brazilian Soil Science Society, 1997.