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Evaluation of a phenological model for strategic decisions for hemp (Cannabis Sativa L.) biomass production across European sites |
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| Authors: | Stefano Amaducci Michele ColauzziGianni Bellocchi Salvatore Luciano CosentinoKatri Pahkala Tjeerd Jan StomphWim Westerhuis Alessandro ZattaGianpietro Venturi |
| Institution: | a Institute of Agronomy and Crop Science, Università Cattolica del Sacro Cuore, 29122 Piacenza, Italy b Department of Agroenvironmental Science and Technology, University of Bologna, 40137 Bologna, Italy c Research Institute for Industrial Crops, Agricultural Research Council, 40128 Bologna, Italy d Institute of Agronomy and Crop Science, University of Catania, 95123 Catania, Italy e Agrifood Research Finland, Plant Production Research, Crops and Biotechnology, 31600 Jokioinen, Finland f Wageningen University, Crop and Weed Ecology Group, 6700AK Wageningen, The Netherlands |
| Abstract: | The optimal combination of yield and quality of hemp fibres from field grown crops is around flowering. Therefore prediction of flowering time would support in planning production and optimization of the cultivar choice for different agro-ecological zones. In the current paper the validation of a recently published model (Amaducci et al., 2008a) is carried out for four varieties across a wide range of sites and thus of air temperature-photoperiod combinations. The model was evaluated by comparing its output to field observations of the duration between emergence and 50% flowering. The model output and observed times from emergence to 50% of flowering generally corresponded well, but some discrepancies were apparent. The biggest discrepancies between estimates and actual data were observed at extreme latitudes. The level of accuracy of the model predictions is satisfactory for strategic decision regarding sowing and harvesting time and cultivar choice, but tactical decisions (e.g. time of harvest based on flowering time) cannot be accurately supported. |
| Keywords: | Hemp (Cannabis sativa L ) Modelling Parameterization Phenology Photo-period |
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