|
T
|
Air temperature |
°C |
|
Tbc, Tbf
|
Base temperature for chilling, forcing |
°C |
|
t
|
Time |
hour [h], day [d] or year [a] |
|
t
0
|
Start of the chilling period (dormancy) |
day of the year [DOY] |
|
t
1
|
Chilling requirement completed, start of forcing |
day of the year [DOY] |
|
t
2
|
Forcing completed (BBCH 60, BBCH 65) |
day of the year [DOY] |
|
Sc, Sf
|
State of chilling, state of forcing |
– |
|
Rc, Rf
|
Rate of chilling, rate of forcing |
– |
|
D
|
Daylength |
h |
|
a, b, c
|
Calibration parameters |
– |
|
i, s, z
|
Index variables |
– |
|
θ
|
Blossom frost risk |
– |
|
β
|
Temperature threshold for blossom frost |
°C |
|
λ
|
Parameter for calculation of mean and confidence level |
– |
