chapter 1 Whole System Integration and Modeling — Essential to Agricultural Science and Technology in the 21st Century -- chapter 2 Forage-Livestock Models for the Australian Livestock Industry -- chapter 3 Applications of Cotton Simulation Model, GOSSYM, for Crop Management, Economic, and Policy Decisions -- chapter 4 Experience with On-Farm Applications of GLYCIM/GUICS -- chapter 5 Benefits of Models in Research and Decision Support: The IBSNAT Experience -- chapter 6 Decision Support Tools for Improved Resource Management and Agricultural Sustainability -- chapter 7 An Evaluation of RZWQM, CROPGRO, and CERES-Maize for Responses to Water Stress in the Central Great Plains of the U.S. -- chapter 8 The Co-Evolution of the Agricultural Production Systems Simulator (APSIM) and Its Use in Australian Dryland Cropping Research and Farm Management Intervention -- chapter 9 Applications of Crop Growth Models in the Semiarid Regions -- chapter 10 Applications of Models with Different Spatial Scales -- chapter 11 Modeling Crop Growth and Nitrogen Dynamics for Advisory Purposes Regarding Spatial Variability -- chapter 12 Addressing Spatial Variability in Crop Model Applications -- chapter 13 Topographic Analysis, Scaling, and Models to Evaluate Spatial/Temporal Variability of Landscape Processes and Management -- chapter 14 Parameterization of Agricultural System Models: Current Approaches and Future Needs -- chapter 15 Parameterization of Agricultural System Models: Current Approaches and Future Needs -- chapter 16 Future Research to Fill Knowledge Gaps.