Advances in Agronomy

Contributors
Preface
Chapter One: Advances in Using Oxygen Isotope Ratios of Phosphate to Understand Phosphorus Cycling in the Environment
Abstract

1 Introduction

2 Stable Isotope Systematics: Oxygen Isotope Ratios of Phosphate

3 Organic Phosphorus and Isotope Effects of Organic Phosphate Mineralization: Enzyme- and Substrate-Specific Isotope Effects

4 Measuremnt of Oxygen Isotope Ratios of Phosphate in Sediments, Soils, and Natural Waters

5 Isotope Effects of Abiotic and Biotic Processes Involving Phosphates

6 Application of Oxygen Isotope Ratios in Phosphate to Understand P Cycling in Soil Environments and Agricultre

7 Concluding Remarks and Perspectives

Acknowledgments

Chapter Two: Agronomic Biofortification of Cereal Grains with Iron and Zinc
Abstract

1 Introduction

2 Biofortification of Cereal Grains

3 Micronutrients in Human Nutrition

4 Functions and Deficiency of Fe and Zn in Humans

5 Agronomic Biofortification of Cereal Grains

6 Management Practices Other Than Fertilizer Affecting Fe and Zn Concentration in Cereal Grains

7 Soil Factors Affecting the Availability of Fe and Zn to Plants

8 Plant Factors Affecting Uptake of Fe and Zn

9 Conclusion

Chapter Three: GlobalSoilMap: Toward a Fine-Resolution Global Grid of Soil Properties
Abstract

1 Introduction

2 Information for Soil Assessment

3 Digital Soil Mapping and Origins of GlobalSoilMap

4 Technical Specifications of GlobalSoilMap

5 Minimum Data Set

6 Methods for Estimating Soil Properties Using Legacy Data

7 Uncertainty

8 Information Architecture, Web Services, and Applications

9 Examples

10 Toward an Enduring Global Soil Information System

11 Conclusions

Acknowledgments

Chapter Four: Fertilizer Intensification and Its Impacts in China's HHH Plains
Abstract

1 Introduction

2 Characteristics of the HHH Region

3 Impacts on Agronomic Production

4 Synthesis of Past Achievements

5 Conclusions

Acknowledgments

Chapter Five: Nutrient Management and Use Efficiency in Wheat Systems of South Asia
Abstract

1 Introduction

2 Wheat Systems in South Asia

3 Nutrient Recommendations in Wheat in South Asia

4 Fertilizer Use in Wheat in South Asia

5 Trends in Nutrient Use Efficiency in Wheat

6 Transformations, Losses, and Interaction of Nitrogen with Irrigation in Relation to Management of Fertilizer Nitrogen in Wheat

7 Nutrient Management in Wheat in Salt-Affected Soils

8 Nutrient Management in Wheat Grown Under Conservation Agriculture

9 Integrated Management of Organic and Inorganic Nutrient Sources in Wheat

10 Long-Term Nutrient Management Effects on Sustainability of Wheat Productivity

11 Strategies to Enhance Nutrient Use Efficiency in Wheat

12 Conclusions and Research Needs

Acknowledgments

Chapter Six: Ammonia-Oxidizing Archaea Play a Predominant Role in Acid Soil Nitrification
Abstract

1 Introduction

2 An Overview of Nitrification Activity in Acid Soils

3 Evidence Supporting a More Important Role of AOA in Acid Soils: Field Studies and Microcosm Incubations

4 Spatial Distributions of AOA and AOB Along the Soil pH Gradient

5 Possible Mechanisms for AOA Nitrification in Acid Soils

6 Future Perspectives on Deciphering Microbial Mechanisms for Nitrification in Acid Soils

Acknowledgment

Index