| pcu_model {ChillModels} | R Documentation |
Positive Chill Units - PCU
Description
Quantifies the chill accumulation by means of converting temperatures to positive chill-units - Modified Utah Model.
Usage
pcu_model(x, total = TRUE)
Arguments
x |
Vector containing temperature values (Celsius-degree). |
total |
TRUE Shows the total value of accumulation, FALSE shows the value of chill-unit for each temperature (TRUE is default). |
Details
The PCU Model is the modified Utah Model. When the temperature is above 15.9°C, the chill-unit is 0. This modification was made because when the Utah model is applied in warm conditions, accumulation becomes negative.
Value
The function returns values the chill-units for each temperature of vector.
References
Richardson, E. A. et al. 1974. "A Model for Estimating the Completation of Rest for 'Redhaven' and 'Elberta' Peach Trees". Research Reports & Notes.
Linsley-Noakes, G. C. et al. 1995. "Estimating daily positive Utah Chill units using daily minimum and maximum temperatures".
Examples
x <- rnorm(500, 15, 4)
pcu_model(x)
pcu_model(x, FALSE)