|Authors: ||S.M. Hassan, Z.A. Abd Alhafez|
|Keywords: ||apiole, D-carvone, α-phellandren, plastic film-essential oil %, UV radiation|
One of the most interesting developments in commercial protected cropping in recent years is the introduction of spectral plastic filter films in the horticultural industry.
These plastic films can be used to clad tunnels used in current growing systems.
They selectively absorb or transmit specific wavelengths and particularly in the UV region.
Thus, they allow studies of effects of the spectral quality and quantity on growth, morphology and yield of many plant species.
Here different plastic types (UVO-blocker and Stander) have been used to study the growth of dill (Anethum graveolens L.) under a low tunnel compared to outside a low tunnel.
The results indicated that, the UVO-blocker significantly increased plant height, fresh weight % and dry weight % of shoot and root.
Dill oil percentage significantly increased under the Stander plastic (0.068%) compared to plants outside (0.046%). Our studies showed that dill leaves contain 37 various essential oils consisting of eugenol, trans-caryophyllene, mefranal, beta-santalene, pentadecane, apiole, eudesmol, haxadecanol, methyl undecanoate, limonene, n-octane, α-phellandren, sabinene bicycle, d-carvone and cyclo hexasiloxane and other oils.
The percentages of essential oil and main components of dill oil were affected by the spectral properties of the plastic.
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