Agricultural Policy / Production Management / Water Supply / Maize / Evapotranspiration / Water Stress / Minas Gerais / Rio Grande do Sul / High Temperature / Spatial Variation / Soil Type / Indexation / Risk Map / Soil Water Balance / Sowing-date / Water Stress / Minas Gerais / Rio Grande do Sul / High Temperature / Spatial Variation / Soil Type / Indexation / Risk Map / Soil Water Balance / Sowing-date