modified_utah_model: Modified Utah model

In EduardoFernandezC/dormancyR: Functions to Compute Chill Metrics

Modified Utah model

Description

Function to calculate winter chill for deciduous trees according to the Modified Utah model proposed by Linvill (1990). This function is compatible with some chillR functions (i.e tempResponse) to estimate metrics from hourly temperature records.

Usage

modified_utah_model(HourTemp, summ = TRUE)

Arguments

HourTemp	Vector of hourly temperatures
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

Linvill D. 1990. Calculating chilling hours and chill units from daily maximum and minimum temperature observations. HortScience 25(1): 14-16. https://doi.org/10.21273/HORTSCI.25.1.14

Examples

library(chillR) 

#Example 1

data <- stack_hourly_temps(KA_weather, latitude = 50.62)
modified_utah_model(data$hourtemps$Temp, summ = TRUE)

#Example 2

tempResponse(data, Start_JDay = 345, End_JDay = 58,
             models = list(Modified_Units = modified_utah_model))
             

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