Potassium Dynamics in Soils. - I. Introduction. - II. General Characteristics of Soil K. - III. Forms of Soil Potassium. - IV. Inorganic and Organic Colloids Important in Potassium Dynamics. - V. Techniques for Measuring Potassium Dynamics. - VI. Equations and Models to Describe Potassium Dynamics in Soils and Clay Minerals. - VII. Effect of Temperature on K Dynamics. - VIII. Dynamics Between Solution and Exchangeable Phases of Potassium. - IX. Kinetics of Nonexchangeable and Mineral Potassium Release. - X. Use of Kinetics for Determining Thermodynamics of Potassium Exchange in Soils. - XI. Summary and Future Research Needs. - References. - Models to Assess the Susceptibility of Soils to Excessive Compaction. - I. Introduction. - II. Definitions. - III. Modeling Laboratory Soil Compaction. - IV. Ease/Susceptibility of Soils to Compaction. - V. Excessive Compaction. - VI. Water Contents and Applied Stresses Not Conducive to Excessive Compaction. - VII. Acceptable Loads Versus Drainage. - VIII. Modeling Field Soil Compaction. - IX. Application of Field Soil Compaction Models. - X. Areas of Future Research. - References. - Sources Amounts and Forms of Alkali Elements in Soils. - I. Introduction. - II. Differentiating Characteristics. - III. Geochemistry. - IV. Mineralogy. - V. Soil Content. - VI. Soil Forms. - References. - The Diagnosis and Recommendation Integrated System (DRIS). - I. Introduction. - II. Nutrient Concentration and Aging. - III. DRIS Norms. - IV. Making a Diagnosis: Use of a DRIS Chart. - V. Calculating DRIS Indices. - VI. Nutrient Index Interpretation. - VII. Testing DRIS Norms. - VIII. Comparisons of DRIS and Other Diagnostic Systems. - IX. Effect of Leaf Age and Position on DRIS Indices. - X. Universality of Foliar Norms. - XI. Expansion of DRIS Beyond Nutrient Ratios. - XII. Conclusions. - XIII. References. - Soil-Related Nutritional Problem Areas for Grazing Animals. - I. Introduction. - II. General Considerations of Trace Element Problems in Plants and Animals. - III. Geographical Distribution of Nutritional Problem Areas for Grazing Animals. - IV. General Discussion. - V. Future Outlook. - References. Language: English