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Discrete dynamic approach to modelling cold hardiness (Hc), where Hc on the current day is equal to the change in Hc (ΔHc) added to the Hc from the previous day (Hc,i = ΔHc + Hc,i–1). Chilling degree-days (DDc) below a threshold temperature (Tth) lead to acclimation, whereas heating degree-days (DDh) above Tth lead to deacclimation.
