pcu_model: Positive Chill Units - PCU

In RPertille/ChillModels: Processing Chill and Heat Models for Temperate Fruit Trees

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)

RPertille/ChillModels documentation built on July 19, 2020, 7:36 p.m.