Soil organic matter

Abstract: AN EXAMINATION OF THE DEGTJAREFF METHOD FOR DETERMINING SOIL ORGANIC MATTER, AND A PROPOSED MODIFICATION OF THE CHROMIC ACID TITRATION METHOD A. WALKLEY;I. BLACK; Soil Science

Abstract: This introduction to modern soil chemistry describes chemical processes in soils in terms of established principles of inorganic, organic, and physical chemistry. The text provides an understanding of the structure of the solid mineral and organic materials from which soils are formed, and explains such important processes as cation exchange, chemisorption and physical absorption of organic and inorganic ions and molecules, soil acidification and weathering, oxidation-reduction reactions, and development of soil alkalinity and swelling properties. Environmental rather than agricultural topics are emphasized, with individual chapters on such pollutants as heavy metals, trace elements, and inorganic chemicals.

Abstract: 1 The Soils Around Us 2 Formation of Soils from Parent Materials 3 Soil Classification 4 Soil Architecture and Physical Properties 5 Soil Water: Characteristics and Behavior 6 Soil and the Hydrologic Cycle 7 Soil Aeration and Temperature 8 Soil Colloids: Seat of Soil Chemical and Physical Activity 9 Soil Acidity 10 Soils of Dry Regions: Alkalinity, Salinity, and Sodicity 11 Organisms and Ecology of the Soil 12 Soil Organic Matter 13 Nitrogen and Sulfur Economy of Soils 14 Soil Phosphorus and Potassium 15 Micronutrients and Other Trace Elements 16 Practical Nutrient Management 17 Soil Erosion and Its Control 18 Soils and Chemical Pollution 19 Geographic Soils Information 20 Prospects for Global Soil Quality Appendix A Soil Classification: World Resource Base Autralian and Canadian Systems Appendix B SI Units, Conversion Factors, Periodic Table of the Elements and Scentific Names of Plants Mentioned Glossary Index

Abstract: The soils around us -- Formation of soils from parent materials -- Soil classification -- Soil architecture and physical properties -- Soil water: characteristics and behavior -- Soil and the hydrologic cycle -- Soil aeration and temperature -- Soil colloids: seat of soil chemical and physical activity -- Soil acidity -- Soils of dry regions: alkalinity, salinity, and sodicity -- Organisms and ecology of the soil -- Soil organic matter -- Nitrogen and sulfur economy of soils -- Soil phosphorus and potassium -- Calcium, Magnesium and trace elements -- Practical nutrient management -- Soil erosion and its control -- Soils and chemical pollution -- Geographic soils information -- Prospects for global soil quality as affected by human acitvities.