Expanding the number of Land Utilization Types 178Strengthen the capabilities in GAEZ to assess alternative ecosystem functions 178The inclusion of water conservation practices in dry regions 17913. Appendix 3-1 Calculation of Reference Evapotranspiration 14. Appendix 3-2 Example of Module I output at grid-cell level Basic characteristics of grid cell Agro-climatic indicators Temperature profile characteristics Reference moisture balance Daily values of reference soil moisture balance 15. Appendix 4-1 Crops and Land Utilization Types (LUTs) 16. Appendix 4-2 Parameters for calculation of water-limited yields of annual crops 17. Appendix 4-3 Temperature Profile Requirements 18. Appendix 4-7 Example of Module II output at grid-cell level Basic characteristics of grid cell Agro-climatic indicators Moisture profile characteristics Crop yields 19. Appendix 5-1 Agro-climatic constraints 20. Appendix 6-1 Combinations by crop, input level and water supply 21. Appendix 6-2 Soil Drainage Classes 22. Appendix 6-3 Soil requirements for rain-fed crops 23. Appendix 6-4 Soil requirements for irrigated crops (gravity irrigation) 24. Appendix 6-5 Soil requirements for Irrigated crops (drip irrigation) 25. Appendix 6-6 Soil suitability assessment examples for rain-fed maize 26. Appendix 6-7 Available Soil Water Capacity (AWC) by soil group and by topsoil texture for FAO'90 and FAO'74 soil classifications 27. Appendix 6-8 Terrain Slope Ratings 28. Appendix 6-9 Suitability of water-collecting sites Short-term dry-land crops (I) Short-term dry-land crops (II) Short-term dry-land crops (III) Short-term dry-land crops (IV) Wetland rice (V) Cassava, citrus, coffee, jatropha, yam and cocoyam (VI) Sugarcane, napier grass, miscanthus and switch grass (VII) Banana/plantain, oil palm, cocoa, para rubber, coconut and tea (VIII) Natural pastures and reed canary grass (IX) Olives (X) 29. Appendix 6-10 Fallow period requirements Crop groups 30. Appendix 7-1 Suitability of major crops under historical climate 31. Appendix 7-2 Crop summary tables 32. Appendix 8-1 Downscaling of area, production and yield of crops Input data used at administrative unit level Statistical and non-spatial information 279 GIS data (at 5 arc-minutes) 279 Main equations and constraints 280 Grid-cell crop share allocation 282 Solution algorithm 284 i Abbreviations AEZ Agro-Ecological Zones AWC Available soil Water Capacity BADC British Atmospheric Data Centre

[fre] Le Programme Alimentaire et Agricole de l'Institut International d'Analyse des Systèmes Appliqués a développé un vaste système global de modèles destinés à étudier les problèmes de la politique agricole. Cet article décrit les résultats préliminaires d'une analyse basée sur ce système tentant de tirer les conséquences économiques de bien-être d'un régime de libre-échange. Il conduit à une hausse des prix agricoles mondiaux de l'ordre de 20 à 25% due à la disparition de l'effet dépressif du protectionnisme. Cette hausse de prix^ favorise surtout l'économie des pays en développement ainsi que les pays développés faiblement protégés. ïïîe stimule une expansion du commerce international, en particulier pour les produits animaux. Le bien-être mondial s'améliore, mais certaines couches de la population la plus pauvre des pays en développement risquent de souffrir de la hausse des prix des denrées de base. [eng] The Food and Agriculture Program at the Institute of Applied Systems Analysis has over a number of years developed a large global model system with the purpose of studying agricultural policy issues. This article reports on preliminary findings of the economic and welfare effects of a general introduction of free trade. At free trade world market prices rise by 20 to 25 percent, as the downward pressure on these prices of protection is released. This triggers economic gains, particularly for developing countries and lowly protected developed countries, and a considerable expansion of world trade, particularly in animal products. Globa! welfare improves, but the poorest layers of the population in developing countries may suffer from the higher prices.