Abstract
Rice cultivation represents one of the highlights in the economy of the southern region of Brazil, however its production may suffer negative impacts related to climatic variations. This study aimed to evaluate the corrected average of crop yield irrigated rice (PMCAI), as well as, the influence of the El Nino/Southern Oscillation (ENSO) phenomenon and the Standardized Precipitation Index (SPI), Standardized Precipitation Evapotranspiration Index (SPEI) and Oceanic Nino Index (ONI) indexes in the Mirim-Sao Goncalo watershed. PMCAI values for this region were used from the harvest of 1984/1985 up to 2019/2020. The ENSO occurrence periods were identified from data obtained by the National Weather Service, within the same mentioned harvest period using the ONI. The reference precipitation and evapotranspiration data were applied to calculate the SPI and SPEI indexes. The results indicated the PMCAI variable did not show significance at the level of 5% in relation to the occurrence of the ENSO phenomenon. In turn, the analysis of the SPEI and SPI indices for the month of December and the ONI in most of the months, showed a significant correlation with the PMCAI.
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