Agroclimatic zoning for rice planting in the central mesoregion of the Maranh？o State

The aim of this study is to accomplish a climatic risk zoning to define the best season to planting rice in the central region of Maranh？o State. There were used data from the Brazilian Institute of Geography and Statistics; Historical series of precipitation and temperature obtained from the National Water Agency and National Institute of Meteorology. The agroclimatic risk zoning was accomplished using the SARRAZON program. The climatic risk for sowing rice was defined as follows: ISNA> 0.65 - Low climatic risk, favorable region to the planting; 0.55