The leaf samples of cultivated Cinnamomum osmophloeum Kaneh. were collected from Tai-tong and Chiayi farms, respectively. Their essential oils were extracted and analyzed. through one-year's examinations, both yields and compositions of essential oils had been found to vary with the cultivating locations and growing seasons. From July through September, the yields of essential oils were at their maxima. The average percentage of cinnamaldehyde was determined to be more than 70% in most samples. However, this composition's seasonal variations for samples from different clones and planting locations were not quite consistent with each other. Other major compositions included benzaldehyde, 4-allylanisole, geranyl acetate, and cinnamyl acetate. Besides, either the yield of essential oil or the percentage of cinnamaldehyde from Tai-tong's leaf sample was observed to be higher than that from Chia-yi's sample from the same clone, collected in the same month.
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