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Table 3 Applied clusters of phenology models. Models starting accumulation of forcing units (FU) at a specific day of year (DOY) are forcing (F) or photoperiod incorporating forcing (F.PP) models. Models starting FU accumulation after reaching a threshold for chilling units (CU) are chilling-and-forcing (CF) or chilling-and-forcing and photoperiod incorporating (CF.PP) models

From: Changing risk of spring frost damage in grapevines due to climate change? A case study in the Swiss Rhone Valley

  Starting DOY according to length of day Starting DOY according to summed CU
Temperature F models CF models
Temperature and photoperiod F.PP models CF.PP models