Is it possible to simulate rapeseed organ mass in relation to N nutrition ? Calibration of the functional-structural model GREENLAB for the oilseed rape Brassica napus L. during the vegetative phase for two nitrogen nutrition levels

The dynamics of leaf and pod apparition and loss play a key role in rapeseed plant growth, as it controls the biomass production and repartition among organs. The source/sink ratio in turn influences appearance and disappearance of organs. Our objective is to investigate this interaction and its consequences on seed growth and development in order to better understand yield variability and seed quality (oil and protein content). In order to quantify the dynamics of C offer and demand, the functional-structural model GREENLAB is being used. It models the interactions between morphogenesis and growth. Biological processes are described according to needs. The mathematical form of GREENLAB allows estimating the ecophysiological parameters of the model (photosynthesis parameters, sink strengths, sink functions) from experimental data by using optimization procedures. The model is being calibrated for rapeseed plant and will be used to investigate the interactions between morphogenesis and biomass production by simulating plant development and growth in response to nitrogen (N) nutrition. In this study we present the calibration procedure for the vegetative phase over autumn and winter for two nitrogen nutrition levels.

[1]  M. Andersen,et al.  Development and evaluation of a CERES-type model for winter oilseed rape , 1998 .

[2]  Jari Perttunen,et al.  LIGNUM: A Tree Model Based on Simple Structural Units , 1996 .

[3]  Yan Guo,et al.  Modeling of biomasse acquisition and partitioning in the architecture of sunflower , 2003 .

[4]  B. Habekotté.  A model of the phenological development of winter oilseed rape (Brassica napus L.) , 1997 .

[5]  Hervé Sinoquet,et al.  Adaptation of the crop model STICS to intercropping. Theoretical basis and parameterisation , 2003 .

[6]  P. de Reffye,et al.  Parameter optimization and field validation of the functional-structural model GREENLAB for maize. , 2006, Annals of botany.

[7]  J. Dejoux,et al.  Evaluation of environmentally-friendly crop management systems based on very early sowing dates for winter oilseed rape in France , 2003 .

[8]  Mengzhen Kang,et al.  Building Virtual Chrysanthemum Based on Sink-Source Relationships: Preliminary Results , 2006 .

[9]  M. Andersen,et al.  A model of leaf area development and senescence for winter oilseed rape , 1998 .

[10]  P. de Reffye,et al.  A dynamic, architectural plant model simulating resource-dependent growth. , 2004, Annals of botany.

[11]  Harri Hakula,et al.  Components of functional-structural tree models , 2000 .

[12]  M. Jeuffroy,et al.  Is crop N demand more closely related to dry matter accumulation or leaf area expansion during vegetative growth , 2007 .

[13]  Loïc Pagès,et al.  GRAAL: a model of GRowth, Architecture and carbon ALlocation during the vegetative phase of the whole maize plant: Model description and parameterisation , 2003 .