1. The New Zealand Institute for Plant & Food Research Limited Agricultural Production system SIMulator: Combining soil and weather data with management rules to estimate production and environmental impact

2. The New Zealand Institute for Plant & Food Research Limited Why use models? Models are essential research tools  Formal collection of crop and soil knowledge  Framework for analysing results  Mechanism to expand inference space System Model Quantitative Plant and Soil Research Component trails Env & Mgmt System outcome Scenario Predicted outcome

3. The New Zealand Institute for Plant & Food Research Limited What is APSIM? Farm system modelling platform  Sound science in crop and soil models  Robust software architecture  Flexible and user friendly

4. The New Zealand Institute for Plant & Food Research Limited Procedure

5. The New Zealand Institute for Plant & Food Research Limited Simulation.sim APSIM Structure APSIM GUI Simulation.apsim Simulation.sim APSIM.exe soilN.dll soilwat.dll crop1.dll crop2.dll Simulation.out weather.met

6. The New Zealand Institute for Plant & Food Research Limited Scope

7. The New Zealand Institute for Plant & Food Research Limited Soil Validation

8. The New Zealand Institute for Plant & Food Research Limited APSIM Development ~ 20 developers  PFR, AgResearch, CSIRO, DPIQ, UQ, DairyNZ SVN version control used  keeping track of changes  Isolating errors  Ensuring model performance  Sharing enhancements

9. The New Zealand Institute for Plant & Food Research Limited APSIM Development Toowoomba SVN server (Bob) APSIM developer Complete build Test runs Build report Produce instillation Publish validation results on website Release

10. The New Zealand Institute for Plant & Food Research Limited APSIM development Module validation  Soil water, Soil organic matter, Solute  Wheat, barley, peas, maize, lucerne Module development  Pasture, brassica, vege’s, kiwifruit Model application Policy planning Management guidelines

11. The New Zealand Institute for Plant & Food Research Limited APSIM Development Toowoomba SVN server (Bob) APSIM developer Complete build Test runs Build report Produce instillation Publish validation results on website Release

12. The New Zealand Institute for Plant & Food Research Limited