ISHS Acta Horticulturae 276: II International Symposium on Computer Modelling in Fruit Research and Orchard Management
AN APPLE TREE DORMANCY MODEL FOR SUBTROPICAL CONDITIONS |
| Authors: | J.I. del Real-Laborde, J.L. Anderson, S.D. Seeley |
| Abstract:
A three dimensional model proposed for apple trees evaluates the effectiveness of different temperatures between dormancy induction and dormancy release. The model uses the Chill Unit (CU), defined as the equivalent of one hour exposure to the optimal temperature during the optimal physiological time for dormancy development. Temperature activity for dormancy development has a sigmoidal pattern, and effectiveness of temperature varies with length of exposure, temperature cycling and time. The model more accurately predicts dormancy development under subtropical conditions than previous models and more accurately predicts the amount of leafing in spring; r2 was 0.66 for the Utah Chill Unit Model and 0.74 for the CU model under Mexican conditions. | |
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