Winkler index
Sum of degree days over 10 celsius of TG from April 1 until October 31
wki(data, data_names = NULL, na.rm = FALSE, ...)
data |
daily mean temperature, Celsius |
data_names |
names of each period of time |
na.rm |
logical. Should missing values (including NaN) be removed? |
... |
further arguments passed to or from other methods |
temperature, Celsius
Winkler, A.J., J.A. Cook, W.M. Kliewer, and L.A. Lider. 1974. General Viticulture. 4th ed. University of California Press, Berkeley.
data(data_all) wki(data = data_all$tg)
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.