Table 5

Parameter value combinations that minimize root mean square error (RMSE) after reparametrizing the predictive discrete-dynamic model to simulate bud cold hardiness for five cold climate interspecific hybrid grapevine cultivars. Cold hardiness (Hc) predictions begin at Hc, initial, which is the earliest median low temperature exotherm (LT50) observed. Predictions are bound by lower (Hc, max) and upper (Hc, min) limits. Hc, max is the lowest LT50 observed, while Hc, min is highest LT50 observed. Other parameters include endodormant temperature threshold (Tth,endo), ecodormant temperature threshold (Tth,eco), endodormant acclimation rate (ka,endo), ecodormant acclimation rate (ka,eco), endodormant deacclimation rate (kd,endo), ecodormant deacclimation rate (kd,eco), theta exponent in deacclimation logistic equation (θ), and ecodormancy boundary (EDB).

Table 5