Variation (1) Rules (1) Rules (1) Event history analysis (1) Year (1) Water (1) Time (1) Irrigation farming (1) Fashion (1) Farmers (1) Economics (1) Culture (1) Crop rotation (1) Climatology (1) Climate (1) Building sites (1) Authors (1) Manpower (1) Management (1) Prizes, etc (1) Use (1) Usage (1) Attitudes (1) Science (1) Organization (1) Irrigation (1) Agricultores (1) Rotación de cultivos (1) Moda (1) Organizaciones (1)