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    DETERMINATION OF YIELD AND QUALITY PARAMETERS OF OIL SUNFLOWER GENOTYPES GROWN IN TURKEY
    (Soc Field Crop Sci, 2020) Gul, Volkan; Coban, Furkan
    Sunflower (Helianthus annuus L) has gained importance in the world as a significant oilseed for vegetable oil. The reactions of the same sunflower genotypes to varying ecologies are different, and yield and yield characteristics may vary depending on this. In this study, we were interested in understanding the differential sensitivity of specific sunflower genotypes to different agro-ecological environments in Turkey. A 2-year (2015-2016) study was conducted on a clay-loam soil in a low and high altitude environment to (i) evaluate the genotype x location x year interaction (GxLxY) for sunflower genotypes, (ii) predict yield components performance and identify high stable sunflower genotypes, and (iii) make genotype-specific management and high performing genotype recommendations within and across agro-ecological regions. The highest yield of seed and oil yield was obtained from the Coral (G(1)) genotypes, averaging 3558.5 and 1535.6 kg ha(-1), respectively in Erzurum and from the 64LC108 (G(4)) genotypes averaging 2905.7 and 1267.4 kg ha(-1), respectively in Samsun ecological conditions. As a result, the determination of the sunflower genotypes suitable for the region will provide the opportunity to obtain high-yield and high quality products because the soil, environment and climatic factors of the region in which they are grown are very useful in determining seed yield and oil content.
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    Effect of Liquid and Solid Vermicompost Applications on Growth and Yield of Sunflower (Helianthus annuus L.)
    (Adem Yavuz Sonmez, 2021) Gul, Volkan; Coban, Furkan; Ozturk, Erdogan
    Vermicompost, which is not harmfull to the environment, and is increasing in agricultural production in terms of both gaining to the soil and benefiting the waste. This research was carried out in 2019 in Bayburt ecological conditions in order to determine the impacts of different doses of solid (250, 500 and 750 kg da(-1)) and liquid (0, 250, 500 and 750 ml da(-1)) vermicompost fertilizers on the flowering and maturation period (days), stem diameter (cm), table diameter (cm), plant height (cm), thousand weight (g) seed yield (kg da(-1)), seed internal rate (%) oil ratio (%) and oil yield (kg da(-1)) of sunflower (Helianthus annuus). In the experiment, it was determined that all parameters were statistically significant compared to p<0.01. The highest seed (218.7 kg da(-1)) and oil yield (75.9 kg da(-1)), which are the most important parameters in oil sunflower, were obtained in 750 kg da(-1) solid and 750 ml da(-1) Liquid vermicompost application (K3S3). As a result, the use of solid and liquid vermicompost application in oil sunflower together will be beneficial in obtaining the highest healthy, high quality seed and oil yield.
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    Evaluation of Phenotypic Traits and Essential Oil Content in Wild-Grown Achillea biebersteinii Populations in Northeastern Türkiye
    (2026) Coban, Furkan; Gül, Volkan; Çakır, Ahmet
    Achillea biebersteinii Afan., a medicinal and aromatic plant widely distributed in Türkiye, is valued for its essential oil content and bioactive compounds. This study aimed to investigate the phenotypic variation, yield performance, and essential oil content of A. biebersteinii populations collected from ten different locations in northeastern Türkiye. A total of six morphological and agronomic traits plant height (PH), inflorescence diameter (ID), stem diameter (SD), number of flowering branches (NFB), dry herbage yield (DHY), and dry flower yield (DFY) alongside essential oil content (EO), were evaluated. ANOVA results revealed statistically significant differences among locations for PH, DHY, and NFB, indicating strong environmental or genetic influences. In contrast, EO content showed no significant variation across locations, suggesting greater genetic stability. Correlation analysis indicated a strong positive association between NFB and DHY, while EO content was negatively correlated with PH and SD. Principal Component Analysis further clarified trait associations and revealed distinct groupings among locations, with L9 and L10 showing superior yield performance and L3 standing out for its high EO content. These findings highlight the substantial phenotypic and chemotypic diversity of A. biebersteinii in northeastern Türkiye and underscore the importance of location specific selection in breeding and conservation programs. The identification of high-yielding and high-quality populations provides a valuable resource for sustainable utilization of this species in medicinal and aromatic plant sectors.
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    The Effect of Sugar Beet (Beta vulgaris L.) Varieties Grown Under Semi-Arid Conditions in Turkey's Eastern Anatolia Region on Yield and Quality
    (Springer, 2026) Bagci, Ikram; Gul, Volkan; Sefaoglu, Firat; Lan, Yuzhou; Coban, Furkan
    Global climate change, which is increasingly evident today, leads to significant fluctuations in the yield and quality parameters of sugar beet varieties, particularly due to its direct impact on semi-arid regions. Therefore, the adaptation capacity of varieties especially in the semi-arid areas of eastern regions and their responses to drought and temperature stress are of critical importance. This study was conducted during the 2022-2023 growing seasons to evaluate the yield and quality performance of ten sugar beet varieties (Seranada, Lider, Mohican, Terronova, Aranka, Turbata, Bernache, Setenil, Tisserin, and Chevalier) within a continental agro-ecological zone characterized by high altitude and a semi-arid climate. The results revealed significant differences among the varieties in terms of all examined traits. The highest root yield was obtained from Chevalier (95.30 ton/ha) and Mohican (94.17 ton/ha), while Tisserin produced the lowest (71.34 ton/ha). In terms of sugar yield, Terronova ranked highest (16.18 ton/ha), whereas Tisserin (12.44 ton/ha) and Setenil (12.34 ton/ha) showed the lowest performances. The Lider variety recorded the highest sugar content (18.22%), indicating its potential as a quality-oriented genotype. Overall, Mohican and Terronova demonstrated the most favorable responses under semi-arid conditions. These findings underscore the importance of regional variety testing for identifying high-yielding and high-quality sugar beet genotypes, especially in environments affected by altitude, climate variability, and soil characteristics.