in medicinal plants field we can change WUE( water use efficiency) by using effective material instead of dry matter.
the amount of water required for oil extraction will depend upon the several factors like nature of plant sample; apparatus used, nature of oil present, volatility of oil. In a clavenger type apparatus the sample should be merged in the water and and and for 1mg oil 500ml water may be sufficient.
Dear Saeid,
Already participated in a study that evaluated the efficiency of water use in a medicinal plant. Really are few studies on irrigated farming these species. The WUE (weight / m³) is determined following the Doorenbos & Kassam (1994)'s equation: WUE = Y / W, Were Y is the yeld (g, t, kg for ha) and W is the water consumed by the crop (m³ / ha). The efficiency of water use will be in accordance with the climatic conditions and the response of the plant. I do not need exact values for your question, but the observed results, the WUE for the production of dry matter was approximately 1 kg to 1 m³ consumed. For the essential oil, the order was approximately 7g of essential oil for every m³. More details are in work Determination of crop coefficient (Kc) and water use efficiency for irrigated peppermint rosemary (in Portuguese).
I hope you resolve your doubts.
Regards,
Ivan Alvarenga
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