1. East Africa Tradeoff Analysis Workshop Bio-physical working group

2. Workshop Program Program Monday Introduction to TOA approach Tuesday AM Conceptual framework Tuesday PM Introduction to TOA software Wednesday/ Thursday AM Disciplinary breakout groups Thursday PM TOA applications to Machakos system Friday Collaborating team work plans & presentations

3. Objectives 1.Get acquainted with the bio-physical datasets. 2.Learn how to set up data for the TOA model. 3.Backgrounds on Nutmon and DSSAT simulations. 4.Relevance of spatial variability. 5.Discuss the new advances to deal with data limitations and soil dynamics 6.Understand the process to run advanced scenarios.

4. Today’s program 8:30-9:00 General introduction 9:00-10:00 The NUTMON toolbox 10:00-10:30 Coffee 10:30-11:00 DSSAT 11:00-12:15 Discussion questions 12:30-13:30 Lunch 13:30-14:30 NUTMON exercises 14:30-15:00 DSSAT and inherent productivities 15:00-15:30 Coffee 15:30-17:00 Analysis of variance

5. Tomorrow’s program 8:30-9:00 General introduction 9:00-10:30 Climate change scenarios 10:30-11:00 Coffee 10:30-12:00 Drought resistant maize varieties 12:00-12:30 Discussion

6. Conceptual framework

8. Basic GIS data for Machakos

9. See c:\to31_mk\arcview\machakos.apr

10. Data acquisition Digital soil mapping Climate interpolation Model callibration

11. Traditional soil survey Scale Number of observations 100625 2,500 10,000 62,500 250,000

12. Parent material Topography Tillage erosion Land management Climate Causes of soil variability

13. Cause 1: Parent material

14. R2R2 Results

15. Cause 2: topography

16. R2R2 Results

17. Cause 3: Soil variability

19. Tillage erosion = f(distance, topography) No tillage erosion Strong tillage erosion Cause 3: Soil variability

20. R2R2 Results

21. Cause 4: Land management

23. R2R2 Results

24. Cause 5: Climate

25. R2R2 Results

26. Results: detailed soil survey

27. Climate interpolation