ISHS Acta Horticulturae 444: III International Symposium on Kiwifruit
PHENOLOGY AND FRUIT QUALITY OF KIWIFRUIT UNDER DIFFERENT ENVIRONMENTS |
| Authors: | D. Spano, P. Deidda, S. Dettori, C. Cesaraccio, P. Duce, M. Pala |
| Keywords: | Actinidia deliciosa, temperature, phenological stages, Degree-Day model |
| Abstract:
Weekly phenology and fruit quality data were taken over four years on two Sardinian areas covering the geographical and climatic range of the region. Accumulated Degree-Days were calculated using the single sine method in order to check the response of kiwifruit to different environmental conditions. The accuracy of the Degree-Day (°D) model was tested in terms of variability of accumulated heat and occurrence of phenological stages. The analysis of the °D model results showed that 10 °C threshold provides a better prediction of phenological stage occurrence in comparison to the 8 °C threshold. Regression of the dates of phenological stage occurrence and number of accumulated °D showed that the model accounted for 96% of the variance in the two sites. Fruit quality data showed the effect of different air temperature range on acid and soluble solids content during the ripening stage. | |
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