Study of the impact of different indices associated with El Niño southern oscillation on soybean yield in Rio Grande do Sul

Authors

  • Diogo Alessandro Arsego Universidade Federal de Santa Maria, Santa Maria, RS, Brasil
  • Simone Erotildes Teleginski Ferraz Universidade Federal de Santa Maria, Santa Maria, RS, Brasil
  • Nereu Augusto Streck Universidade Federal de Santa Maria, Santa Maria, RS, Brasil
  • Andrea de Oliveira Cardoso Universidade Federal de Santa Maria, Santa Maria, RS, Brasil
  • Alencar Junior Zanon Universidade Federal de Santa Maria, Santa Maria, RS, Brasil

DOI:

https://doi.org/10.5902/2179460X30684

Keywords:

Interannual variability, soybean yield, El Niño Southern Oscillation

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.

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Author Biography

Diogo Alessandro Arsego, Universidade Federal de Santa Maria, Santa Maria, RS, Brasil

Meteorologista formado pela UFSM. Possui mestrado e doutorado em Meteorologia pela UFSM.

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Published

2018-03-22

How to Cite

Arsego, D. A., Ferraz, S. E. T., Streck, N. A., Cardoso, A. de O., & Zanon, A. J. (2018). Study of the impact of different indices associated with El Niño southern oscillation on soybean yield in Rio Grande do Sul. Ciência E Natura, 40, 82–87. https://doi.org/10.5902/2179460X30684

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