02870nam a2200373 a 450000100080000000500110000800800410001902000180006010000180007824500250009626000300012130000110015149000390016252019620020165000220216365000190218565000180220465000150222265000090223765000190224665000240226565000230228965000160231265000240232865000150235265000230236765000140239065000140240465000210241865000090243965000190244865300130246770000160248011916032003-10-09       1978    bl uuuu      00u1 u    #d  a0-444-41610-21 aSCHNITZER, M.  aSoil organic matter.  aAmsterdam: Elsevierc1978  a319 p.  a(Developments in Soil Science, 8).  aHumic substances: chemistry and reactions. Synthesis of humic substances. Extraction of humic substances. Fractionation and purification. The characterization of humic materials. The analysis of humic substances - non-degradative methods. Degradative methods. The isolation of alkanes and fatty acids from humic substances. The chemical structure of humic substances. Reactions of HA's and FA's with metals and minerals. Reactions of humic substances with organic compounds. Physiological effects of humic substances. Carbohydrates in soil. General nature of carbohydrates; nomenclature. Carbohydrate distribution in soil. Composition of soil carbohydrates. Properties of soil polysaccharides. Origin of soil polysaccharides. Behaviour and significance of soil carbohydrates. Organic nitrogen, phosphorus and sulfur in soils. Some characteristics of source materials. Total organic N, P and S soils. Analytical limitations. Fractionations. Biologically "meaningful" fractions. The interaction of organic matter with pesticides. Nature of pesticides. Mechanisms of adsorption. Adsorption isotherms. Adsorption of specific types of pesticides by organic matter. Adsorption of pesticides of pesticides by organic matter - clay complexes. Techniques used in pesticides - organic matter interaction studies. Chemical alteration and binding of pesticides. Soil organic carbon, nitrogen and fertility. Carbon and nitrogen and effect of soil forming factors on them. Effects of management on soil organic matter. Nitrogen transformations in soil. Environmental factors affecting mineralization. Dynamics of organic matter transformations. Nitrogen availability and its estimation. Fertility related factors. Soil organic sulfur and fertility. Nature and distribution of organic sulfur in soil. Effects of management on soil organic sulfur. Sulfur transformations in soil. Environmental factors affecting mineralization. Sulfur availability and availability indexes.  aorganic compounds  aorganic matter  aorganic soils  apesticides  aSoil  asoil fertility  aSoil organic matter  aComposto Orgânico  aFertilidade  aFertilidade do Solo  aFisiologia  aMatéria Orgânica  aNutriente  aPesticida  aQuímica do Solo  aSolo  aSolo Orgânico  aOrganico1 aKHAN, S. U.