chill_days: Chill days (Cesaraccio _et al._, 2004)

In EduardoFernandezC/dormancyR: Functions to Compute Chill Metrics

Chill days (Cesaraccio et al., 2004)

Description

This function computes the Chill Days according to the model proposed by Cesaraccio et al. (2004) developed for several tree species including pears, kiwifruit and sweet cherries. In this function chill days are computed without the negative (-) transformation made in the original paper.

Usage

chill_days(ExtrDailyTemp, summ = TRUE)

Arguments

ExtrDailyTemp	Dataframe containing columns "Tmax" and "Tmin". These values must correspond to daily records
summ	Boolean parameter indicating whether the computed metric should be provided as cumulative values over the period or as the actual accumulation for each hour

References

Cesaraccio C., Spano D., Snyder R. and Duce P. 2004. Chilling and forcing model to predict bud - burst of crop and forest species. Agric. For. Meteorol. 126(1-2): 1-13. doi:10.1016/j.agrformet.2004.03.002

Examples

library(chillR)

#Example 1

chill_days(KA_weather, summ = TRUE)

#Example 2

data <- KA_weather
data[,"Chill_Days"] <- chill_days(data, summ = FALSE)

#Example 3

tempResponse_daily(KA_weather, Start_JDay = 345, End_JDay = 58,
                    models = list(Chill_Days = chill_days))
                    

EduardoFernandezC/dormancyR documentation built on Aug. 24, 2022, 7:21 a.m.