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The growth and development of a crop involve interactions between many physical, chemical, and biological processes. Crop growth models facilitate the study of the effect of these interactions on crop yield. Potato yields simulated by the SUBSTOR model were compared with measured values at Saint-Catherine-de-Ia-JacquesCartier near Quebec, QC. A sensitivity analysis was performed to identify the crop input parameters to which SUBSTOR is most sensitive. Results of the sensitivity analysis showed that SUBSTOR outputs related to yield are sensitive to changes in the date of emergence and genetic parameters, especially variations in the degree of determinacy and potential tuber expansion rate. SUBSTOR was calibrated in 1992 and verified in 1993. Results of the simulations show that, on average, SUBSTOR overestimated potato dry yield by 4% in 1992 and underestimated it by 15% in 1993. In 1992 and 1993, maturity dates were simulated accurately, but maximum leaf area index was overestimated. Tuber initiation date was accurately simulated in 1993 and underestimated by to days in 1992. Since 1992 and 1993 were wet years, the crop is not likely to have suffered from water stress. However, simulated soil water content was underestimated during the growing season in 1993 that resulted in underestimation of potato yield. Keywords: SUBSTOR, simulation, yield, potatoes, model.
M.H. Mahdian and J. Gallichand 1997. ESTIMATING POTATO YIELD WITH THE SUBSTOR MODEL IN QUEBEC. Canadian Agricultural Engineering 39(3):157-164.
Canadian Society for Bioengineering