Pollen season of winter rape (Brassica napus L.) in the Czech and Slovak Republic in the period 1996 - 2008
Abstract
The winter rape (Brassica napus L.) is very important oil plant also important plant for pollen allergology. CHMI and SHMI observe these phenophases: emergence (BBCH10), first leaves (BBCH11), stem elongation (BBCH30), beginning of flowering (BBCH61), full flowering (BBCH65), end of flowering (BBCH69) and yellow ripeness (BBCH85).
The mean date of onset of beginning of flowering is from April 26th to May 8th in Czechia and from April 23rd to May 5th in Slovakia. From the trend analysis there is the shift of phenological onsets towards to earlier date.The interphase interval proceeds from 21 to 30 in Czechia and from 22 to 27 days in Slovakia.
The mean earliest onsets of beginning and also end of flowering of this plant occurred in year 2007 in both countries.