Wiki source code of VM Phenology

Last modified by geosens on 2025/03/17 21:54
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1 The VitiMeteo Phenology Model simulates the phenological stages of grapevine development using a temperature-based approach. The graphs in the model provide an intuitive way to analyze grapevine development and assess forecasts. This article explains how to interpret and utilize the graphs.
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3 == The Graphs ==
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5 Above the graph, the development of the vines are simulated. The phenology model uses the temperature-sum model created by Molitor et al. (2014). The temperature sum is an addition of the daily average temperature. Based of the temperature sum it is possible to use the BBCH scale, which is colorcoded and depicted in the overview above the graph.
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7 [[image:1736508301162-606.png||height="48" width="415"]]
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10 **Weather Data**:
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12 * The top section of the graph displays weather parameters, including temperature, humidity, and precipitation.
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15 **BBCH Stages**:
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17 * Below the weather data, the calculated BBCH stages are shown with a color-coded representation. Each color corresponds to a specific macrostage of grapevine development.
18 * The forecast period is shaded in gray to distinguish it from observed or current stages.
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21 **Grapevine Growth**:
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23 * At the bottom, the graph illustrates grapevine growth based on the model developed by H. R. Schultz (Hochschule Geisenheim University).
24 * The total green area represents the full leaf area, with the light green section indicating leaf area still in growth.
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27 [[image:1742248485083-283.png]]
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29 === Huglin Index ===
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31 Within the phenology model there is a description of the huglin index. In the graph you can compare the current vintage to previous vintages. What the huglin index is, is described [[here>>doc:Entwurf.Tools.Huglin index.WebHome]].
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33 [[image:1736513799471-614.png||height="412" width="732"]]
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35 === Blattwachstumsmodell/leaf area growth model ===
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37 Within the the phenology tab you will find the possibility to compare the growth of vine leaves over the years. On the y-axis the simulated growth area is described in cm2. The model is based on the leaf area growth model, written by Prof. Dr. Schultz (1992) (2004).
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39 [[image:1736514812772-361.png||height="398" width="712"]]
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41 Literatur:
42 Lorenz D.H., Eichhorn K.W., Bleiholder H., Klose R., Meier U., Weber E. (1994): Phaenologische Entwicklungsstadien der Weinrebe (Vitis vinifera L. ssp. vinifera). Codierung und Beschreibung nach der erweiterten BBCH-Skala. Wein-Wissenschaft, Wiesbaden [49]: 66-70
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45 Molitor D., Junk J., Evers D., Hoffmann L., Beyer M. (2014): A high resolution cumulative degree day based model to simulate the phenological development of grapevine. American Journal of Enology and Viticulture 65 [1]: 72-80
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48 Schultz H. R. (1992): An empirical model for the simulation of leaf appearance and leaf-area development of primary shoots of several grapevine (Vitis vinifera L) canopy-systems. Scientia Horticulturae, 52(3), 179–200.