Calculate vernalisation time using cardinal temperatures

vernalisation_days(
  mint,
  maxt,
  x_temp = lupin$get("phenology.vernalisation_time.x"),
  y_temp = lupin$get("phenology.vernalisation_time.y")
)

Arguments

mint: The minimum temperature
maxt: The maximum temperature
x_temp: The cardinal temperatures used to calculate vernalisation time. The default values are defined in lupin$get("phenology.vernalisation_time.x").
y_temp: The effective vernalisation time at the corresponding cardinal temperatures. The default values are defined in lupin$get("phenology.vernalisation_time.y").

Value

The vernalisation time (days).

Details

The daily vernalisation time is calculated by interpolating the effective vernalisation time at three hour intervals between the daily minimum and maximum temperatures, and then averaging these values to get the daily vernalisation time.

For more information about the lupin phenology model, see the APSIM Next Generation lupin Documentation.

Examples

mint <- c(0, 10)
maxt <- c(30, 40)
vernalisation_days(mint, maxt)
#> [1] 0.22308540 0.03967708