positive_utah_model: Positive Utah model

In EduardoFernandezC/dormancyR: Functions to Compute Chill Metrics

Positive Utah model

Description

Function to calculate winter chill for deciduos trees according to the Positive Utah model proposed by Linsley-Noakes and Allan (1994). This function is compatible with some chillR functions (i.e tempResponse) to estimate metrics from hourly temperature records.

Usage

positive_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

Linsley-Noakes G. and Allan P. 1994. Comparison of two models for the prediction of rest completion in peaches. Sci. Hortic. 59(2): 107-113. https://doi.org/10.1016/0304-4238(94)90077-9

Examples

#Example 1

library(chillR)

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

#Example 2

tempResponse(data, Start_JDay = 345, End_JDay = 58,
             models = list(Positive_Units = positive_utah_model))

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