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| Soil Fertility - Past and Present | |
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| Ancient Records | |
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| Soil Fertility During the First Eighteen Centuries A.D. | |
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| Progress During the Nineteenth Century | |
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| The Development of Soil Fertility in the United States | |
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| Increasing Crop Yields | |
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| Looking to the Twenty-first Century | |
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| Growth and the Factors Affecting It | |
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| Factors Affecting Plant Growth | |
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| Growth and Growth Expressions | |
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| Modeling Applications in Soil Fertility | |
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| Elements Required in Plant Nutrition | |
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| Essentiality of Elements in Plant Nutrition | |
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| Elements Required in Plant Nutrition | |
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| Function of Nutrients in Plants: Macronutrients | |
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| Function of Nutrients in Plants: Micronutrients | |
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| Basic Soil-Plant Relationships | |
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| Ion Exchange in Soils | |
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| Movement of Ions from Soils to Roots | |
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| Ion Absorption by Plants | |
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| Soil and Fertilizer Nitrogen | |
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| The N Cycle | |
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| N Fixation by Rhizobium and Other Symbiotic Bacteria | |
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| N Fixation by Nonsymbiotic Soil Microorganisms | |
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| N Addition from the Atmosphere | |
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| Industrial Fixation of N | |
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| Forms of Soil N | |
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| Forms of N Absorbed by Plants | |
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| N Transformations in Soils | |
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| Fertilizer N Materials | |
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| Soil and Fertilizer Phosphorus | |
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| The P Cycle | |
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| P Fertilizers | |
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| Soil and Fertilizer Potassium | |
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| K Content of Soils | |
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| Forms of Soil K | |
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| Soil Factors Affecting K Availability | |
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| Plant Factors Affecting K Availability | |
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| K Soil Testing | |
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| K Fertilizers | |
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| Agronomic Value of K Fertilizers | |
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| Soil and Fertilizer Sulfur, Calcium, and Magnesium | |
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| Sulfur | |
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| Calcium | |
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| Magnesium | |
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| Micronutrients and Other Beneficial Elements in Soils and Fertilizers | |
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| General Relationships of Micronutrients in Soils | |
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| Iron | |
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| Zinc | |
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| Copper | |
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| Manganese | |
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| Boron | |
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| Chloride | |
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| Molybdenum | |
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| Cobalt | |
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| Sodium | |
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| Silicon | |
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| Selenium | |
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| Soil Acidity and Basicity | |
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| General Concepts | |
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| Soil Acidity | |
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| The Soil as a Buffer | |
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| Determination of Active and Potential Acidity in Soils | |
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| Soil pH for Crop Production | |
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| Liming Materials | |
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| Use of Lime in Agriculture | |
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| Application of Liming Materials | |
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| Factors Determining the Selection of a Liming Program | |
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| Acidulating the Soil | |
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| Saline, Sodic, and Saline/Sodic Soils | |
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| Soil Fertility Evaluation | |
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| Nutrient-Deficiency Symptoms of Plants | |
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| Plant Analyses | |
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| Biological Tests | |
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| Soil Testing | |
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| Remote Sensing | |
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| Fundamentals of Fertilizer Application | |
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| Crop Characteristics | |
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| Soil Characteristics | |
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| Fertilizer Placement | |
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| General Considerations | |
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| Utilization of Nutrients from the Subsoil | |
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| Fluid Fertilizers | |
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| Fertilizers, Water Use, and Other Interactions | |
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| Nutrient-Water Interactions | |
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| Other Interactions | |
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| Economics of Plant-Nutrient Use | |
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| Fertilizer Use and Prices | |
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| Maximum Economic Yield | |
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| Yield Level and Unit Cost of Production | |
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| Returns per Dollar Spent or Profit per Acre | |
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| What Is the Most Profitable Rate of Plant Nutrients? | |
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| Price of Fertilizer in Relation to the Value of the Crop | |
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| Price per Pound of Nutrients | |
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| Liming | |
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| Animal Wastes | |
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| Plant Nutrients as Part of Increasing Land Value | |
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| Additional Benefits from Maximum Economic Yields | |
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| Cropping Systems and Soil Management | |
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| Soil and Crop Productivity | |
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| OM in the Soil | |
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| Tillage | |
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| Legumes in the Rotation | |
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| Rotations Versus Continuous Cropping | |
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| Winter Cover/Green Manure Crops | |
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| Animal Manure | |
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| Sewage | |
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| Common Conversions and Constants | |
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| Index | |