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Progress in Essential Oils

By: Brian M. Lawrence, Consultant
Posted: July 9, 2009, from the August 2009 issue of P&F magazine.

Singh et al. (2006) examined the effect of harvest time on oil yield and composition of T. minuta grown in an experimental garden in Lucknow (Uttar Pradesh, India). They found that the oil yield was 0.44%, 0.74–0.75% and 1.01% for plants harvested pre-flowering, during flowering and post-flowering (at seed setting time). The main components of the oil produced from the plants harvested at the above mentioned developmental stages can be seen in T-1. The data reveals that the variation experienced in a commercial oil can be caused by intrinsic factors such as plant maturity (ontogeny) as well as cultivar (genetics).

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