Maize yield and rainfall on different spatial and temporal scales in Southern Brazil
Bergamaschi, H., Wheeler, T. R., Challinor, A. J., Comiran, F. and Heckler, B. M. M. (2007) Maize yield and rainfall on different spatial and temporal scales in Southern Brazil. Pesquisa Agropecuaria Brasileira, 42 (5). pp. 603-613. ISSN 0100-204X
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To link to this article DOI: 10.1590/S0100-204X2007000500001
This study aimed to establish relationships between maize yield and rainfall on different temporal and spatial scales, in order to provide a basis for crop monitoring and modelling. A 16-year series of maize yield and daily rainfall from 11 municipalities and micro-regions of Rio Grande do Sul State was used. Correlation and regression analyses were used to determine associations between crop yield and rainfall for the entire crop cycle, from tasseling to 30 days after, and from 5 days before tasseling to 40 days after. Close relationships between maize yield and rainfall were found, particularly during the reproductive period (45-day period comprising the flowering and grain filling). Relationships were closer on a regional scale than at smaller scales. Implications of the crop-rainfall relationships for crop modelling are discussed.