Adapting a cotton model for decision analyses: a yield-response evaluation
1996
Larson, J.A. | Mapp, H.P. | Verhalen, L.M. | Banks, J.C.
Adapting a general crop simulator to a specific locale and validating it present a number of conceptual and practical difficulties. Methods used to adapt the COTTAM simulator for the irrigated cotton (Gossypium hirsutum L.) planting decision in the Oklahoma Rolling Plains are described as well as an evaluation of the response relationships in the model. COTTAM was adapted by considering how user inputs influence lint yield response as a function of planting date, seeding rate, plant population and cultivar. Those factors were used to define the sources of dynamics and risk in making decisions at planting time. Regression methods were employed to estimate production functions for simulated yield from the adapted model. Technical relationships derived from parameter estimates were used to evaluate output of the adapted model. Relationships estimated from adapted simulator output corresponded to those hypothesized from the literature and estimated from available field data.
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