1. Faculty of Resources and Environmental SciencesShanxi Agricultural Univ.TaiguShanxi030801China
2. Harrow Research and Development Centre, Agriculture & Agri‐Food CanadaHarrowONN0R 1G0Canada
3. Dep. of Bioresource EngineeringMcGill Univ.Sainte‐Anne‐de‐BellevueQuebecH9X 3V9Canada