The effect of harvesting period on the oil production was examined on five Eucalyptus species (E. camaldulensis, E. globulus, E. globulus ssp. maïdenii, E. melliodora and E. bosistoana) of Moroccan origin. For some species such as E. camaldulensis, E. globulus and E. globulus ssp. maïdenii, the oil yield seemed to depend on the harvesting season. The period ranging from June to October gave the best yield with a maximum in June. The 1,8-cineole content of Eucalyptus oil may also vary during the year. This was observed in the case of E. globulus and E. melliodora, although the observed changes were rather random. The month for maximum 1,8-cineole content varied depending upon the species.
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Zrira et al. (1996) studied this question.
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