Modelling helps to understand the principal mechanisms affecting ecosystem functioning, and the causes of disturbances to them. They are essential for long term predictions and in making recommendations aimed at reducing harmful effects and preventing environmental disturbances (Ifremer, 2005).Many authors have demonstrated the benefits of using computer models in agriculture (Farage et al., 2005; Paul et al., 2003; Webb et al., 2003; Pumpanen et...