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    Blooming stages of Turkish hyssop (Hyssopus officinalis L.) affect essential oil composition
    (Taylor & Francis As, 2008) Kizil, Suleyman; Toncer, Ozlem; Ipek, Arif; Arslan, Neset; Saglam, Sevil; Khawar, Khalid Mahmood
    Hyssop (Hyssopus officinalis L.), native to the Caucasus, North Western Iran, Turkish North Eastern Black Sea region, and Southern Anatolia, is a highly valued medicinal plant. The experiment was conducted to find the effect of harvesting at different blooming stages of the plant on fresh and dry herbage yield, dry leaf yield, essential oil content, and essential oil components. In total, twenty-nine components were identified in hyssop essential oil by GC/MS. Isopinocamphone was the dominating component (47.9 51.4%) in the all analysed oil samples. The results clearly demonstrated that oil contents are seriously affected by the environmental conditions and stage of blooming, with the highest oil yield and oil contents at the post-blooming stage.
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    Effect of different developing stages on some agronomical characteristics and essential oil composition of oregano (Origanum onites)
    (Rsnz Publishing, 2008) Kizil, Sueleyman; Ipek, Arif; Arslan, Neet; Khawar, Khalid Mahmood
    This study reports effects of three plant development stages (pre-flowering, full flowering, and post-flowering) of oregano (Origanum onites) on plant height, fresh herbage yield, dry herbage yield, dry leaf yield, essential oil content, and essential oil yield. The results showed that the highest fresh, dry herbage, and dry leaf yield were obtained at the post-flowering stage. However, dry leaf and essential oil yield showed a variation between 4.45-5.68 t ha(-1) and 119.3-190.1 litre ha(-1), respectively. Essential oil content was significantly affected by plant development stages and the highest oil content (3.65%) was obtained at the full flowering stage. The major components of essential oil were determined as carvacrol (42.12-57.0%), thymol (13.21-21.88%), and linalool (8.23-20.28%).
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    Öğe
    Some Agronomical Characteristics and Essential Oil Content of Oregano (Origanum onites L.) as Influenced by Planting Densities
    (Taylor & Francis Ltd, 2009) Kizil, Sueleyman; Ipek, Arif; Arslan, Neset; Khawar, Khalid Mahmood
    Oregano (Origanum onites L.) a highly valued medicinal plant, is rich in essential oil. The objective of the experiment was to determine the relative importance of planting densities on yield components and essential oil components of O. onites under semi and rain fed conditions of South East Anatolian Turkey. Plant densities and environmental conditions affected growth components, essential oil percentage and essential oil yield variabilty. The results suggested variation among fresh and dry herb yield, dry leaf yield and essential oil composition in O. onites during two years of experimentation. Totally-twenty-six components were identified in the oregano essential oil by GC-MS. Carvacrol (39.6 - 52.2 %) dominated all components identified in the essential oils. 45 x 20 cm plant density showed economical optimum herbage and oil yield on the non-calcareous and soils of Diyarbakir in the Southeastern Anatolian Turkey.