Modélisation de la croissance, des relations sources-puits et du rendement en sucre de la betterave sucrière (Beta vulgaris L.) sous des régimes contrastés de nutrition azotée

Abstract : The French sugar beet industry seeks to increase productivity in order to obtain sugar yields economically satisfactory. Nitrogen fertilization is one of the main factors influencing yield of sugar beet. Many models are designed to simulate the yield of sugar beet but few take into account the effect of nitrogen nutrition conditions. In this context, the objectives of this work were: (i) to reflect leading to the choice of the type of modeling, (ii) to identify the plant characteristics in response to nitrogen nutrition for parameterization of the model and (iii) evaluate our model.The modeling approach has focused on the integration of the nitrogen nutrition effects on the leaf area development, and source-sink relationships within the plant. Two years field experiments have enabled us to acquire data necessary for the study of the sugar beet responses under contrasting nitrogen nutrition conditions and parameterization of the model. A compilation of a data set validation at the ITB makes it possible to take into account parameters variability. We found that sugar beet responded to nitrogen nutrition as the other C3 plants. The model simulates the differences in sugar yield based on nitrogen nutrition status as reported in the literature. The model can find growth stages of sugar beet without force them. Coupled to the supply nitrogen module of the STICS crop model, the model simulates the major trends in yields over the past thirty years.
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Anne Didier. Modélisation de la croissance, des relations sources-puits et du rendement en sucre de la betterave sucrière (Beta vulgaris L.) sous des régimes contrastés de nutrition azotée. Sciences agricoles. AgroParisTech, 2013. Français. ⟨NNT : 2013AGPT0040⟩. ⟨pastel-00949047⟩

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