Abstract:

Dynamic changes of the contents of essential oil from oil-bearing rose introduced in Yangling were studied systematically. The results showed that fully developed rose flowers had the highest content of essential oil. Flowers must be picked during this period. In the whole bloom season (about one month), the yields of the flowers increased gradually, and then decreased. The contents of essential oil were higher in the flowers picked either at the initial or final bloom stages,lower at the stage of full bloom. The content of essential oil was negatively correlated with the yields of flowers. The optimum time for flower picking in a day was between 5:00～8:00 am, and could be lasted longer in the cloudy or raining day.

Key words: Rose rugosa, content of essential oil, dynamic change