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    Determinetion of Agronomic and Quality Characteristics of Black Cumin Species (Nigella sativa L. and N. damascena L.) Sowed At Different Times
    (4th International Symposium of Medicinal and Aromatic Plants Symposium, 2018) İzgi, Mehmet Necat; Telci, İsa
    This study aims to determine the proper sowing time for the growers of black cumin, a species of the Nigella sativa and N. damascena species of Nigella genus. The study was carried out under the climatic conditions of Mardin plain during 2011-2012 and 2012-2013 vegetation periods. The plants were sowed in four different times: two times in autumn (November 10 and November 25) and two times in spring (March 03 and March 17). Agronomical and quality characteristics of the species sown four different times were investigated in the study. It was found a significant difference between sowing times for all the characteristics examined in the study. In the 2-year average, the seed yield of sativa (3725.8 kg/ha) was found to be higher than that of damascena (2829.0 kg/ha). Higher yields were obtained in both species in autumn sowing. The study determined that damascena, which is more susceptible to cold climate, is not affected by winter sowing in the region and that autumn sowing should be preferred more for both species to obtain higher yields.
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    Effects of different nitrogen doses on thymoquinone and fatty acid composition in seed oil of black cumin (Nigella sativa L.)
    (JAOCS, Journal of the American Oil Chemists' Society, 2021) Telci, İsa; Izgi, Mehmet Necat; Ozek, Temel; Yasak, Selma; Yur, Suleyman; Ozek, Gulmira
    Black cumin, Nigella sativa L. belonging to Ranunculaceae, is a valuable medicinal plant because of the curative effects of seed and oil. Despite studies on black cumin, there are few studies on the effects of nitrogen on fatty acid composition, no records on thymoquinone yield, and the thymoquinone content of the seed oil. In this study, the effects of different nitrogen doses on the seed oil yield, thymoquinone ratio/yield, and fatty acid compositions were investigated. Field studies with nitrogen doses (0, 40, 60, 80, and 100 kg/ha) were studied using the randomized plot design. As a result of the research, nitrogen doses significantly affected the oil and thymoquinone yields while insignificant on the thymoquinone ratio. The highest oil yield with 501.6 kg/ha was obtained from 80 kg/ha of the nitrogen doses, while the highest thymoquinone yield with 10.24 kg/ha was obtained from the control plots. Thymoquinone yields were in the same statistical group with other nitrogen doses, except for means of 100 kg/ha nitrogen doses. Linoleic, oleic, and palmitic acids were major fatty acids of black cumin, and their variations were insignificant in nitrogen applications. The values of butyric, capric, and linolenic acids varied significantly in different nitrogen doses. As a result of the study, it was determined that the highest oil yield was obtained from 80 kg/ha nitrogen application. It has been determined that nitrogen doses above 60-80 kg/ha should be avoided for the seed oil and thymoquinone yields in black cumin.
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    VARIATION OF FATTY ACID COMPOSITIONS IN CORIANDRUM(CORIANDRUM SATIVUM L. ) CULTIVAR GROWN IN TWO DIFFERENT ECOLOGY
    (Necmettin Erbakan Üniversitesi, 2017) İzgi, Mehmet Necat; Telci, İsa
    Coriander, Coriandrum sativum L., belonging Apiaceae family is an important spice plant grown in different locations of Turkey. The study was aimed to investigate the composition of fatty acid compositions of 6 coriander cultivars (Gamze, Arslan, Erbaa, Pelmus, Kudret, and Gürb üz) in two different ecologies of Turkey (Tokat and Mardin). The oils obtained with cold extraction were analyzed by Gas Chromatography. In the Results, total 22 fatty acids were identified in the cultivars. Petroelinic acid was the major fatty acid in all varieties, followed by linoleic acid and palmitic acid. The variation of the major fatty acids was limited in the study. The highest amount of petroselinic acid was changed between 80.5-82.6% and the highest value was reached in Arslan variety in Mardin. Palmitic acid, which is saturated fatty acid in all varieties, was found high in Mardin, while unsaturated fatty acid linoleic acid in Tokat. It was concluded that the effect of regions on fatty acids was little in the study.