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Revista mexicana de ciencias agrícolas

versão impressa ISSN 2007-0934

Resumo

ESPANA BOQUERA, María Luisa et al. Computational model to build virtual canopies of strawberry. Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.2, pp.291-302. ISSN 2007-0934.

Virtual canopies are used in ecophysiological models to study how plants work. The purpose of this work was to develop a computer model to build virtual canopies of strawberry plants and evaluate the ability of these to simulate intercepted radiation (approximated with the void fraction), fundamental to the processes of photosynthesis and transpiration. The model represents each plant as a set of sheets, from the average surface of its central leaflet, the average number of leaves per plant and planting geometry. The relationship between the size of leaflets and petiole follow normal distribution functions, adjusted with field data. Data was collected in three sampling areas of 1 m2, in a plot of production, where leaves were measured four times to simulate different densities of vegetation. Simultaneously, photographs were taken from illumination angles at, 0º, 15º and 30º, to measure the void fraction near nadir, to estimate the light intercepted by the leaves around solar noon. The model was used to build virtual canopies equivalent to those measured in field. Linear correlations between the void fraction (from each illumination angle) of the actual canopy (photographs) and virtual (projections) were calculated; obtaining r> 0.98 and RMSE <0.023. The model satisfactorily represents the canopy of strawberry plants which corresponds to light interception and can be used to simulate performance models of a crop.

Palavras-chave : Fragaria vesca L.; computational model; ecophysiological modeling; virtual canopy.

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