chapter 6 Modeling Acidification Processes in Agricultural Systems -- chapter 7 Using Geographic Information Systems (GISs) in Soil Acidification Risk Assessments -- chapter 8 Micro- and Macroscale Heterogeneity of Soil Acidity -- chapter 9 Measurements of H+ Fluxes and Concentrations in the Rhizosphere -- chapter 10 Toxic Elements in Acid Soils -- chapter 11 Using Lime to Ameliorate Topsoil and Subsoil Acidity -- chapter 12 Role of Organic Matter in Alleviating Soil Acidity -- chapter 13 Fertility Management of Tropical Acid Soils for Sustainable Crop Production -- chapter 14 Role of the Genotype in Tolerance to Acidity and Aluminum Toxicity -- chapter 15 Managing Soil Acidification Through Crop Rotations in Southern Australia -- chapter 16 Managing Acidification and Acidity in Forest Soils -- chapter 17 Role of pH in Phytoremediation of Contaminated Soils.