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SIRIUS wheat simulation model

Sirius is a wheat simulation model that calculates biomass from intercepted photosynthetically active radiation (PAR) and grain growth from simple partitioning rules. Leaf area index (LAI) is developed from a simple thermal time sub-model. Phenological development is calculated from the mainstem leaf appearance rate and final leaf number, with the latter determined by responses to daylength and vernalisation. Effects of water and N deficits are calculated through their influences on LAI development and radiation-use efficiency. Sirius has been calibrated for several modern wheat cultivars and was able to simulate crop growth accurately in a wide range of conditions, including Europe, NZ/Australia and USA and under climate change


  • Jamieson PD, Semenov MA, Brooking IR & Francis GS (1998) Sirius: a mechanistic model of wheat response to environmental variation. Europ J Agronomy, 8:161-179
  • Jamieson PD, Brooking IR, Semenov MA & Porter JR (1998) Making sense of wheat development: mechanisms of response to daylength and temperature Field Crops Research,55:117-127
  • Jamieson PD & Semenov MA (2000) Modelling nitrogen uptake and redistribution in wheat. Field Crops Research, 68:21-29
  • Brooks RJ, Semenov MA & Jamieson PD (2000) Simplifying Sirius: sensitivity analysis and development of a meta-model for yield prediction Europ J Agronomy, 14:43-60
  • Lawless C, Semenov MA & Jamieson PD (2005) A wheat canopy model linking leaf area and phenology Europ J Agronomy, 22:19-32
  • Semenov MA ,Jamieson PD & Martre P (2007) Deconvoluting nitrogen use efficiency in wheat: a simulation study, Europ. J Agronomy, 26:283-294
  • Semenov MA, Martre P & Jamieson PD (2009) Quantifying effects of simple wheat traits on yield in water-limited environments using modelling approach. Agric.Forest Meteorology, 149:1095–1104


M.A. Semenov
Rothamsted Research
United Kingdom

P.D. Jamieson
Crop & Food Research
New Zealand

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