Advances in Agronomy

Chapter One: Soil: The Forgotten Piece of the Water, Food, Energy Nexus
J.L. Hatfield, T.J. Sauer and R.M. Cruse

• Abstract
• 1 Introduction
• 2 Soil—A Missing Nexus Component
• 3 Scale of the Interface Between Soils and Ecosystem Services
• 4 Implications of Soil as a Component of the Food, Energy, Water Nexus
• 5 Challenges

Chapter Two: Humin: Its Composition and Importance in Soil Organic Matter
M.H.B. Hayes, R. Mylotte and R.S. Swift

• Abstract
• 1 Introduction
• 2 Historical Perspectives of Humic Substances and Humin
• 3 Modern Approaches to Studies of Humin^a
• 4 Information About the Isolation and Compositions of Humin From Applications of Different NMR Procedures
• 5 Possible Sources of Humin Components Derived From Plant and Microbial Sources
• 6 Summation, Significance, and Future Directions

Chapter Three: Effects of Drought Stress on Morphophysiological Traits, Biochemical Characteristics, Yield, and Yield Components in Different Ploidy Wheat: A Meta-Analysis
J.-Y. Wang, Y.-C. Xiong, F.-M. Li, K.H.M. Siddique and N.C. Turner

• Abstract
• 1 Introduction
• 2 Methodology
• 3 Responses to Drought Stress in Different Ploidy Wheat
• 4 Implications and Future Directions
• Acknowledgments

Chapter Four: Delineation of Soil Management Zones for Variable-Rate Fertilization: A Review
S. Nawar, R. Corstanje, G. Halcro, D. Mulla and A.M. MouazenAbstract

• 1 Introduction
• 2 Conceptual Framework and Main Steps of MZs
• 3 MZ Delineation Approaches
• 4 Application Maps for VR Fertilization
• 5 Opportunities for Evaluation MZs by Cost/Benefit Analysis
• 6 A Case Study: Site-Specific N Application for Oil Seed Rape (OSR) Crop Based on MZ Delineation With Multisensor and Data Fusion Approach
• 7 Conclusions
• Acknowledgments