|
The value of the first day number index is fixed and is not influenced by air temperature or any other environmental variable. (See Above ground characteristics with time) | |
|
The value of DayNumber(1) is put to the day number in the spring when the accumulated sum of air temperatures above TempSumCrit reaches the value of TempSumStart. The accumulation of temperatures starts when the day length exceeds 10 hours. Five consecutive days in the autumn with day lengths shorter than 10 hours and with temperatures below TempSumCrit ºC terminates the growing season. |