02122nam a2200385 a 450000100080000000500110000800800410001902000180006010000180007824500670009626000810016330000100024450003290025452008380058365000100142165000160143165000190144765000110146665000090147765000190148665000200150565000270152565000240155265000110157665000230158765000090161065300140161965300120163365300150164565300110166065300120167170000170168370000190170070000170171919328852015-09-03       1990    bl uuuu      00u1 u    #d  a0-89118-104-01 aMACCARTHY, P.  aHumic substances in soil and crop sciencesbSelected readings.  aMadison: American Society of Agronomy; Soil Science Society of Americac1990  a281p.  aProceedings of a symposium cosponsored by the International Humic Substances Society; Divisions S-3, S-2, S-4, S-5, and S-7 of the Soil Science Society of America; Divisions A-1 and A-5 of the American Society of Agronomy; and Divisions C-2 and C-3 of the Crop Science Society of America, Chicago, Illinois, 2 december 1985.  aConversion factors fo SI and non-SI units; An introduction to soil humic substances; Variations between humic substances isolated from soils, stream waters, and groundwaters as revealed by 13C-NMR spectroscopy; Synthesis and degradation of natural and synthetic humic material in soil; Selected methods for the characterization of soil humic substances; Nitrogen in humic substances as related to soil fertility; Roles of organic matter, minerals, and moisture in sorption of nonionic compounds and pesticides by soil; Effects of humic substances on plant growth; Ecological aspects of soil organic matter in tropical land use; Humic and fulvic acid fractions from sewage sludges and sludge-amended soils; Application of nuclear magnetic resonance spectroscopy to whole soils; Humic substances in soil and crop sciences: an overview.  acrops  adegradation  aorganic matter  asewage  asoil  asoil fertility  aCultivo do Solo  aDeterioração do Solo  aFertilidade do Solo  aHúmus  aMatéria Orgânica  aSolo  aCongresso  aCultura  aDegradacao  aEsgoto  aEventos1 aCLAPP, C. E.1 aMALCOLM, R. L.1 aBLOOM, P. R.