Principles of Soil Chemistry

By Roberto Bianchi
338
2026

Description

This comprehensive text bridges the gap between pure chemistry and the complex, dynamic systems of the earth beneath our feet. Tan masterfully translates abstract chemical laws into clear, actionable insights regarding how soil forms, breathes, retains nutrients, and interacts with the biosphere. The book is uniquely celebrated for establishing an equitable focus on both the organic and inorganic components of soil. Rather than treating soil as merely a matrix of weathered minerals, Tan highlights the vital chemical roles of humic acids, complex carbohydrates, amino acids, proteins, lipids, and even nucleic acids like DNA. By treating soil as a living, three-phase system composed of gas, liquid, and solid components, the text elevates our understanding of nutrient cycling, plant nutrition, and ecological health. Principles of Soil Chemistry distinguishes itself from traditional physical chemistry or geochemistry texts by keeping its focus squarely on the soil-plant-atmosphere continuum. For upper-level undergraduate students, graduate researchers, and environmental professionals, the book provides the definitive scientific foundation needed to tackle 21st-century challenges. Whether diagnosing organic and inorganic soil contamination, mitigating agricultural nutrient runoff, assessing potential ecological health risks, or practicing restorative carbon farming, this classic book remains an indispensable manual for understanding the chemistry that feeds our world.

About Author

Roberto Bianchi is a distinguished researcher and academic with over two decades of expertise in environmental and agricultural sciences. He holds a Ph.D. in Soil and Water Science from the University of California, Berkeley, where his groundbreaking research focused on mineral-organic matter interactions and chemical kinetics in soil ecosystems. Prior to his doctoral studies, Dr. Bianchi earned his M.S. in Agronomy and Environmental Chemistry from the University of Bologna, graduating with top honors. His academic foundation is built upon a B.S. in Chemistry, which provides him with a uniquely rigorous, molecular-level perspective on complex soil processes. Throughout his illustrious career, Dr. Bianchi has served as a senior researcher at the International Centre for Soil Research and has held professorships at leading agricultural universities. He has authored more than 50 peer-reviewed papers in top-tier journals and serves on the editorial boards of several international environmental science publications.

Table of Content

Preface
Chapter 1. Soil Chemistry Fundamentals 

Soil Chemistry Studies Chemical Interactions in Ground 
Redox Reactions Drive Electron Transfer Processes 
Complexation Forms Stable Metal-Organic Associations 
Precipitation and Dissolution Control Solid Phases 
Soil Colloids Dominate Chemical Reactivity 
Acid Sulfate Soils Present Severe Challenges 
Heavy Metals Contaminate Soils
Organic Contaminants Interact with Soil Components
Potassium Dynamics in Soil 
Micronutrients Required in Small Amounts 
Cation Exchange Reactions Balance Nutrients
Environmental Soil Chemistry Applications 

Chapter 2. Soil Components Overview 
Soil Minerals Form the Inorganic Foundation of Soil 
Clay Minerals Exhibit High Surface Area and Reactivity 
Cation Exchange Capacity Measures Nutrient Retention
Adsorption-Desorption Processes Retain and Release Ions 
Nutrient Cycling Maintains Soil Fertility through Time 
Organic Amendments Build Soil Organic Matter 
Contaminant Behavior in Soil Depends on Chemical Speciation 
Soil Chemical Analysis Supports Research and Management 

Chapter 3. Soil Colloids Properties
Definition and Fundamental Nature of Soil Colloids 
Colloid Flocculation and Dispersion Phenomena 
Analytical Methods for Colloid Characterization 
Environmental Significance of Soil Colloids 

Chapter 4. Ion Exchange Capacity 
Ion Exchange Capacity in Soil Chemistry 
Base Saturation and Soil Fertility Relationships 
Temperature Effects on Ion Exchange Equilibria 
Role of Organic Matter in Ion Exchange 
Ion Exchange in Relation to Plant Nutrition 
Modeling Ion Exchange in Soil Systems 

Chapter 5. Soil pH and Acidity 
Soil pH Definition and Fundamental Concepts 
Buffering Capacity and Resistance to pH Change 
Plant Adaptation to Acid Soil Conditions
Interpretation of Soil Test Results for pH 
Global Distribution of Acid Soils 

Chapter 6. Redox Processes in Soil 
Fundamental Concepts of Oxidation and Reduction in Soils 
Oxygen as Primary Electron Acceptor in Aerobic Soils 
Methane Production in Highly Reduced Soils 
Seasonal and Temporal Dynamics of Soil Redox 
Redox Interfaces and their Biogeochemical Significance 
Redox Monitoring Techniques and Methodologies
Redox Effects on Soil Microbial Community Structure 
Redox Processes and Soil Biodiversity 
Redox Processes and Soil Remediation Technologies 
Redox Processes in Soil-Atmosphere Gas Exchange 

Chapter 7. Nutrient Cycling Mechanisms 
Carbon Cycling Forms the Foundation for All Nutrient Transformations in Soil 
Phosphorus Cycling Differs Fundamentally from Nitrogen through Lack of Volatile Forms
Soil Organic Matter Functions as the Central Hub for Nutrient Cycling Processes 
Microbial Biomass Serves as Both Catalyst and Reservoir in Nutrient Cycles 
Mycorrhizal Fungi Extend Plant Access to Soil Nutrients through Symbiotic Associations 
Nitrification Converts Ammonium to Nitrate through Microbial Oxidation 
Ammonia Volatilization Causes Nitrogen Loss from Surface-Applied Urea and Manures 
Anion Exchange Capacity Affects Retention of Nitrate, Phosphate, and Sulfate
Mycorrhizal Networks Transfer Nutrients between Plants through Common Hyphal Connections 
Crop Residue Management Balances Nutrient Return with Decomposition Dynamics
Riparian Buffers Intercept Nutrients Moving from Uplands to Surface Waters 
Forest Nutrient Cycling Features Tight Retention and Efficient Internal Recycling
Nutrient Management Planning Integrates Cycling Principles into Practical Recommendations 
Nutrient Cycling Research Continues Evolving with New Analytical Tools 

Chapter 8. Micronutrients and Trace Elements 
Essential Micronutrients Required for Plant Growth 
Zinc Adsorption on Soil Colloid Surfaces 
Cobalt Function in Symbiotic Nitrogen Fixation
Iron Chlorosis in Calcareous Soil Conditions 
Organic Matter Effects on Micronutrient Cycling 
Micronutrient Management in Organic Production Systems 
Chapter 9. Soil Organic Matter Chemistry 
Historical Development of Soil Organic Matter Chemistry
Humic Substances: Molecular Characteristics and Models 
Lignin and its Transformation Products in Soils
Colloidal Properties of Soil Organic Matter 
pH Effects on Soil Organic Matter Chemistry 
Pyrolysis and Chemolytic Methods for Organic Matter Analysis
Land Use Effects on Soil Organic Matter Chemistry 

Chapter 10. Ion Adsorption Mechanisms 
Fundamental Nature of Ion Adsorption in Soils 
Factors Controlling Ion Selectivity in Adsorption 
Ion Exchange Isotherms and their Interpretation 
Phosphate Adsorption and its Agricultural Significance 
Organic Complexation Effects on Metal Adsorption 
Modeling Ion Transport with Adsorption Reactions

Chapter 11. Soil Solution Equilibria 
Soil Solution Represents Dynamic Aqueous Phase 
Chemical Speciation Determines Ion Behavior
Carbonate Equilibria Buffer Soil pH 
Aluminum Chemistry Governs Acid Soils
Redox Equilibria Control Oxidation States 
Ionic Strength Effects on Chemical Equilibria 
Soil Solution Sampling and Analysis 
Rhizosphere Solution Chemistry 
Soil Solution in Biogeochemical Cycling 
Soil Solution in Sustainable Agriculture 

Chapter 12. Carbonate and Salinity Chemistry 
Carbonate Minerals Dominate Alkaline Soil Chemistry 
Alkalinity Measures Acid-Neutralizing Capacity of Soils 
Specific Ion Toxicity Damages Plant Tissues 
Salt-Tolerant Crops Enable Productive Use of Saline Soils 
Phosphorus Availability Limited in Calcareous Soils 
Carbonate Coatings on Mineral Surfaces Modify Reactivity 
Climate Change Influences Salinity Dynamics in Complex Ways 
Economic Analysis Guides Reclamation Investment Decisions 

Chapter 13. Heavy Metal Mobility 
Fundamental Concepts of Heavy Metal Mobility in Soils 
Iron and Manganese Oxides as Metal Scavengers 
Role of Carbonates in Metal Immobilization 
Phosphate-Induced Metal Immobilization 
Microbial Influences on Metal Mobility 
Transport Mechanisms for Mobile Metals 
Plant Uptake and Bioavailability of Metals

Chapter 14. Soil Chemistry-Physical Interactions 
Soil Colloids as the Interface between Chemistry and Physics 
Flocculation and Dispersion Phenomena 
Crusting and Surface Sealing Processes 
Soil Color as an Indicator of Chemistry-Physical Interactions 
Soil Management and the Maintenance of Structure 
Erosion and its Chemical-Physical Controls 
Wetting Front Instability and Preferential Flow 
Soil Organic Matter and Hydrophobicity 

Chapter 15. Soil-Plant Nutrient Relations
Essential Nutrients for Plant Growth and Development
Nutrient Uptake Mechanisms at Root Surfaces 
Nitrogen Forms and Plant Availability in Soils 
Iron Chemistry and Availability in Soils
Copper Roles in Photosynthesis and Reproduction 
Plant Analysis for Nutrient Status Assessment 
Fertilizer Sources and their Chemical Properties 
Organic Nutrient Sources and Mineralization 
Soil Organic Matter and Nutrient Supply 
Anion Exchange and Phosphorus Retention 
Salt Index and Fertilizer Placement Effects 
Precision Agriculture Technologies for Nutrient Management 

Bibliography 
Index