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Description: 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-la-Jacques-Cartier near Qu?bec, 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 10 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.

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Résumé: La croissance et le d?veloppement d'une culture impliquent l'interaction de plusieurs processus physiques, chimiques et biologiques. Les mod?les de croissance peuvent faciliter l'?tude de l'effet de ces interactions sur le rendement des cultures. Les rendements de la pomme de terre simul?s par le mod?le SUBSTOR ont ?t? compar?s avec ceux mesur?s au champ ? Saint-Catherine-de-la-Jacques-Cartier pr?s de Qu?bec, QC. Une analyse de sensibilit? a ?t? r?alis?e pour d?terminer les param?tres de croissance auxquels SUBSTOR ?tait sensible. Les r?sultats de l'analyse de sensibilit? ont montr? que les sorties du mod?le SUBSTOR reli?es au rendement, sont sensibles ? la variation de la date d'?mergence et aux param?tres g?n?tiques, particuli?rement le degr? de d?termination et le taux potentiel de l'expansion des tubercules. SUBSTOR a ?t? calibr? en 1992 et test? en 1993. Les r?sultats de cette simulation montrent que SUBSTOR a sur-estim? de 4% le rendement sec de la pomme de terre en 1992 et l'a sous-estim? de 15% en 1993. En 1992 et 1993, ce mod?le a simul? pr?cis?ment la date de maturit?, mais surestim? l'indice de surface foliaire maximum. La date d'initiation de la tub?risation a ?t? simul?e pr?cis?ment en 1993 et sous-estim?e de 10 jours en 1992. Puisque 1992 et 1993 furent des ann?es humides, il est peu probable que la culture ait souffert de stress hydrique. Toutefois, en 1993 la teneur en eau a ?t? sous-estim?e par SUBSTOR ce qui a r?sult? en une sous-estimation du rendement de la pomme de terre. Mots cl?s: SUBSTOR, simulation, rendement, pommes de terre, mod?le.
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Volume: 39
Issue: 3
Pages -
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Technical field: Soil and Water Systems Engineering
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