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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The impact of El Nino Southern Oscillation phases on off-season maize yield for a subtropical region of Brazil

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Author(s):
Tojo Soler, Cecilia M. [1, 2] ; Sentelhas, Paulo Cesar [3] ; Hoogenboom, Gerrit [1]
Total Authors: 3
Affiliation:
[1] Univ Georgia, Dept Biol & Agr Engn, Griffin, GA 30223 - USA
[2] Univ Sao Paulo, Dept Rural Engn, BR-13418900 Piracicaba, SP - Brazil
[3] Univ Sao Paulo, Dept Exact Sci, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: INTERNATIONAL JOURNAL OF CLIMATOLOGY; v. 30, n. 7, p. 1056-1066, JUN 15 2010.
Web of Science Citations: 4
Abstract

In recent years, maize has become one of the main alternative crops for the autumn winter growing season in the central-western and southeastern regions of Brazil. However, water deficits, sub-optimal temperatures and low solar radiation levels are common problems that are experienced during this growing season by local farmers. One methodology to assess the impact of variable weather conditions on crop production is the use of crop simulation models. The goal of this study was to evaluate the effect of climate variability on maize yield for a subtropical region of Brazil. Specific objectives for this study were (1) to analyse the effect of El Nino Southern Oscillation (ENSO) on precipitation and air temperature for four locations in the state of Sao Paulo and (2) to analyse the impact of ENSO on maize grown off-season for the same four locations using a crop simulation model. For each site, historical weather data were categorised as belonging to one of three phases of ENSO: El Nino (warm sea surface temperature anomalies in the Pacific), La Nina (cool sea surface temperature anomalies) or neutral, based on an index derived from observed sea surface temperature anomalies. During El Nino, there is a tendency for an increase in the rainfall amount during May for the four selected locations, and also during April, mainly in three of the locations, resulting in an increase in simulated maize yield planted between February 15 and March 15. In general, there was a decrease in the simulated yield for maize grown off-season during neutral years. This study showed how a crop model can be used to assess the impact of climate variability on the yield of maize grown off-season in a subtropical region of Brazil. The outcomes of this study can be very useful for both policy makers and local farmers for agricultural planning and decision making. Copyright (C) 2009 Royal Meteorological Society (AU)

FAPESP's process: 00/09050-0 - Using Ceres-Maize model for maize sown off-season yield forecast in the region of Vale do Paranapanema (SP)
Grantee:Cecilia Manuela Tojo Soler
Support Opportunities: Scholarships in Brazil - Doctorate