Resumo

PENA QUINONES, Andrés Javier et al. EFFECTS OF DAYLENGTH AND SOIL HUMIDITY ON THE FLOWERING OF COFFEE COFFEA ARABICA L. IN COLOMBIA. Rev. Fac. Nac. Agron. Medellín [online]. 2011, vol.64, n.1, pp.5745-5754. ISSN 0304-2847.

Coffee flowering data were analyzed in order to explore the effect of two environmental variables that have been considered relevant for this process. Pre-anthesis stage flowers were counted in coffee leaf-rust resistant crops at eight experimental stations (between 2°N and 11°N). Likewise, climatic data were taken to generate a humidity soil index, whereas day longitude data were taken from the Smithsonian Meteorological Tables. Flowering data were compared with a sunshine index to understand better the effect of light on flowering. This data (flowering, soil humidity index and day length) were expressed in a monthly scale and analyzed using linear regression and cross-correlation functions. The main results show that there is a significant correlation between short days and high flowerings, whereas soil humidity (dry months) are related to the phenomenon, but to a lesser extent.

Palavras-chave : Coffea arabica L; photoperiod; sunshine; cross correlation; Colombia.

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