ISHS Acta Horticulturae 526: V International Symposium on Grapevine Physiology
MODELLING SUNLIGHT INTERCEPTION AND PHOTOSYNTHETIC ACTIVITY-CORRELATION WITH FIELD DATA |
| Authors: | P.D. Haasbroek, J. Myburgh, J.J. Hunter |
| Abstract:
A theoretical radiation model for the prediction of photosynthetic output was developed. The model uses radiation interception inside a canopy and predicts hourly and daily photosynthetic rate. It consists of several semi-empirical equations of which direct and diffuse radiation are the most important. The model was adapted to field conditions by using measurements of radiation data obtained from vines trained to a slanting trellis with a square transverse section. This model was calibrated against photosynthesis measured in the field using an ADC-photosynthesis meter. The curvature of the predicted photosynthesis paralleled the curvature of the measured photosynthesis and a regression with correlation coefficient of 0.9861 and Willmot D-index of 0.9941 was obtained. Further research is necessary to refine the model for application to different trellising systems, cultivars and environmental conditions. | |
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