A model of leaf area development and senescence for winter oilseed rape |
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| Affiliation: | 1. Department of Hydrology, Geological Survey of Denmark and Greenland, Øster Voldagde 10, 1350 Copenhagen, Denmark;2. LandboSyd, Jens Terp-Nielsens Vej 13, 6200 Aabenraa, Denmark;3. Department of Geochemistry, Geological Survey of Denmark and Greenland, Øster Voldagde 10, 1350 Copenhagen, Denmark;4. Department of Agroecology, Aarhus University, Blichers Allé 20, 8830 Tjele, Denmark;5. SEGES, Agro Food Park 15, 8200 Aarhus N, Denmark;1. Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA;2. Department of Land, Air, and Water Resources, UC Davis, Davis, CA 95616, USA;3. Department of Natural Resources, Cornell University, Ithaca, NY 14853, USA;1. Soil Physics and Land Management Group, Wageningen University, Droevendaalsesteeg 4, 6708PB Wageningen, The Netherlands;2. Environment Management Laboratory, Mykolas Romeris University, Ateities g. 20, LT-08303, Vilnius, Lithuania;3. Department of Forestry, Michigan State University, East Lansing, MI 48825, USA;4. Dipartimento dei Sistemi Agro-ambientali, University of Palermo, viale delle scienze, Italy;5. Department of Natural Sciences, Dickinson State University, Dickinson, ND, USA;6. Instituto Pirenaico de Ecología, Consejo Superior de Investigaciones Científicas (IPE-CSIC), Departamento de Procesos Geoambientales y Cambio Global, Zaragoza, Spain;7. Department of Agricultural Chemistry and Soil Science, Faculty of Science, Agrifood Campus of International Excellence - ceiA3, University of Cordoba, Cordoba, Spain;8. MED_Soil Research Group, Dep. of Crystallography, Mineralogy and Agricultural Chemistry, University of Seville, Spain;9. Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Valencia, Spain |
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| Abstract: | In winter crops, leaf area is a major determinant of the final yield, and is substantially affected by losses occurring during vegetative growth. Here, we propose and test a submodel simulating the development of leaf area and pod area, along with leaf senescence, for winter oilseed rape (Brassica napus L.), which was included in a CERES-type model for rape adapted from CERES-N Maize. This crop model, called CERES-Rape, has components for crop phenology, net photosynthesis, N uptake, and assimilate partitioning. As a new feature compared to previously published work, the leaf area submodel includes senescence from shading due to competition for light in the canopy, and from leaf N deficiencies. The model has been developed and parameterised on a 1-yr-long experiment with three fertilizer N treatments in northeastern France, during which measurements of senescing parts allowed calibration of the equations for leaf area index (LAI) senescence and total generated LAI. The leaf area submodel, once coupled to the CERES-Rape model, was tested against two additional experiments from Denmark and northern France. This process-oriented submodel proved accurate for the simulation of actual LAI whether in the calibration or in the validation phase, with an overall Root Mean Square Error (RMSE) of 0.496 m2 m−2, falling close to the mean experimental standard deviation. Extrapolation did not require any further adjustment, although a different cultivar was involved. |
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