| north_carolina {ChillModels} | R Documentation |
North Carolina
Description
Quantifies the chill accumulation by means of converting temperatures to chill-units.
Usage
north_carolina(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 model is based on chill-units and optimum temperature, minimum and maximum temperature limits (They aren't classes), where 1 chill-unit is when the tree is exposure at optimum temperature (7.2°C). When the temperature is above 23°C (maximum temperature limit), the chill-unit is -2. The chill-units accumulation is 0 when occurs temperature below -1.1°C, being the miminum temperature limit.
Value
The function returns values the chill-units for each temperature of vector (Total = FALSE), or returns the chill-units accumulation (Total = TRUE).
References
SHALTOUT, Assem D. & UNRATH, C. R. 1983. Rest Completion Prediction Model for 'Starkrimson Delicious' Apples. J. Amer. Soc. Hort. Sci.
Examples
x <- rnorm(500, 5, 4)
north_carolina(x)
north_carolina(x, FALSE)