COMPARISON OF 5 WHEAT SIMULATION-MODELS IN SOUTHERN ALBERTA

Increasing concentrations of greenhouse gases are expected to result i n global warming which will affect crop production. Crop modelling is a useful tool for assessing the impact of climate change on crop produ ction. The objective of this study was to select an appropriate model for climate change studies. Five simulation models, EPIC, CERES, Centu ry, Sinclair and Stewart, were assessed using data from a long-term ex periment begun in 1911 on a day loam (Dark Brown Chernozem) soil at Le thbridge, AB. Yields predicted by the five models were compared with a ctual spring wheat yields in continuous wheat, fallow-wheat and fallow -wheat-wheat rotations. The EPIC model gave the best simulation result s over all rotations and the most accurate predictions of mean yields during droughts. It was concluded that the EPIC model had the greatest potential for assessing the impact of climate change on wheat yield. The Stewart model was the most accurate for unfertilized continuous wh eat and fallow-wheat. The Sinclair model was most accurate for fertili zed fallow-wheat and CERES was the most accurate model for fertilized continuous wheat. The Century model simulated average yield accurately but did not account for year-to-year variability.