Resumo

CLEVES-LEGUIZAMO, JOSÉ ALEJANDRO; RAMIREZ-CASTANEDA, LEILA NAYIBE  e  DIAZ, ELIECER DAVID. Proposed empirical model for estimating ‘Valencia’ orange (Citrus sinensis L. Osbeck) productivity in the Colombian low tropics. rev.colomb.cienc.hortic. [online]. 2021, vol.15, n.3, e10860.  Epub 07-Jan-2023. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2021v15i3.10860.

The response of citrus crops to environmental supplies largely determines the speed and intensity of ecophysiological processes, which affect crop development and production. The main objective was to analyze the effects of climatic conditions on productivity in ‘Valencia’ orange agroecosystems (Citrussinensis L. Osbeck) in the Department of Meta, Colombia. The climatological variables precipitation (PPT), maximum and minimum temperatures (Tmax and Tmin), wind speed, relative humidity and solar brightness were analyzed from 2013 to 2015. The FAO CropWat model provided the crop reference evapotranspiration (ETo) for the agroclimatic indices. STATGRAPHICS Centurion XVI v. 16.2.04 was used to generate an empirical model that related productivity to agroclimatic indices for the vegetative and reproductive phenological phases. The proposed empirical model explained 49% (P=0.0233) of the oscillation of productivity in the studied agroecosystems. The model, based on agroclimatic indices associated with PPT, ETo, Tmax and Tmin, found that the relationship between productivity and agroclimatic indices was non-linear. The productivity variation was mainly influenced by PPT, the occurrence and magnitude of which determined the volume of production and quality of the fruit. On the other hand, while the increased air temperature and water deficits in the pre-flowering and flowering phases positively favored crop production, these factors produced a negative effect in the fruit setting phase.

Palavras-chave : low tropics; citriculture; productivity; empirical models; climatic data.

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