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- Title
Estudo do impacto de diferentes índices associados ao El Niño Oscilação Sul na produtividade de soja no Rio Grande do Sul.
- Authors
Arsego, Diogo Alessandro; Teleginski Ferraz, Simone Erotildes; Streck, Nereu Augusto; de Oliveira Cardoso, Andrea; Zanon, Alencar Junior
- Abstract
The main factor associated with decreaes in soybean yield in Rio Grande do Sul is the irregular distribution of precipitation and the El Niño Southern Oscillation (ENSO) is the major responsible for the precipitation variability. The aim of this work was to analyze the relationship between climatic indicators associated with ENSO and soybean yield in the State. Series of soybean yield from 87 municipalities were evaluated between 1984 and 2013. These series were ordered in three groups of similar behavior (high, medium and low yield). The mean profiles of these groups were correlated with indices for Sea Surface Temperature anomalies in the Niño 3.4 region, the Southern Oscillation Index (SOI) and the Multivariate ENSO Index (MEI) with differents lags. SOI and MEI showed higher correlations with yield in periods of higher water requirement of the crop. El Niño episodes have been associated with increased yield and in situations of neutrality and La Niña, the influence of the phenomenon is less evident. In addition, the absence of a significant correlation in the time of preparation of the crop and in the beginning of the plantation evidences the necessity of including new indices in the discussions of agricultural planning in the State.
- Publication
Revista Ciência e Natura, 2018, Vol 40, p82
- ISSN
0100-8307
- Publication type
Article
- DOI
10.5902/2179460X30684