ISHS Acta Horticulturae 184: I International Symposium on Computer Modelling in Fruit Research and Orchard Management
A SIMULATION MODEL OF PHENOLOGY AND CORRESPONDING FROST RESISTANCE OF 'GOLDEN DELICIOUS' APPLE |
| Author: | F. Winter |
| Abstract:
At Bavendorf Research Station, the phenology of 'Golden Delicious' apples has been recorded since 24 years. Meteorological data of a weather station are collected as well. Starting from the classical phenological Model of accumulated degrees of temperature, different variations have been checked, to find the best possible approach about all 24 years. A model using a shifting instead of a static threshold level seems to be closer to the reality. The best approximation has been obtained using a threshold level shifting between -1 at full winterrest and +8 degrees Celsius at full blossom time. Because there is a close correlation of the frost hardness evolution to the phenology, we tried to connect a frost resistance submodel This submodel computes currently the 'T 50' frost hardness level for buds and flowers respectively. This level is checked back every day with the minimum temperature. Using a Gauss distribution, a percentage of damaged organs is estimated in case of temperatures near the 'T 50' level. The results are very close connected to the reality of the past 24 years of observation. | |
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