Browsing by Author "Sefaoglu F."

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COMPARATIVE ANALYSIS OF BIOCHEMICAL CONTENT, ANTIMICROBIAL AND ANTIOXIDANT ACTIVITIES OF HYPERICUM PERFORATUM L. SPECIES IS GROWN IN TÜRKİYE
(2023-01-01) Gul V.; Cetinkaya H.; Dinler B.S.; Sefaoglu F.
Many external factors, such as climatic conditions, geographical differences, and altitude, directly affect the primary and secondary metabolites and therapeutic use of St. John's Wort (Hypericum perforatum L.), an important plant in alternative medicine. This study was carried out to identify the antioxidant and antimicrobial activities and the content of proline, malondialdehyde, hydrogen peroxide, flavonoid, anthocyanin, and total phenolic in the St. John's Wort growing naturally in different regions of Bayburt. The St. John's Wort samples were collected from 11 different locations. As a result of the analyses carried out on the plant samples, it was found that the content of proline was within the range of 4.6-8.2 µmol g-1 DW, the amount of malondialdehyde was within the range of 0.69-1.10 nmol g-1 DW, the amount of hydrogen peroxide was within the range of 79.89-155.49 µmol g-1 DW, the amount of flavonoids was within the range of 91.38%-100.27%, the amount of anthocyanin was within the range of 0.15-1.11 mkmol g-1 DW, the total phenolic content was within the range of 15.82-45.22 mg GAE g-1, and the antioxidant activity was within the range of 6.07-105.60 µg mL-1. In conclusion, although the biochemical contents and nonenzymatic antioxidant activities showed a wide variety, the antioxidant activity was found to be higher in samples 5, 8, and 11. According to the antimicrobial activity results, some plant extracts were effective on bacteria and fungi, especially samples 5, 6, 8, and 11 showed an effect at the concentration of 200 μg mL-1. This study, the first regional study on this subject, will contribute to future research and clinical trials in the health field.
CRITICAL DOSE OF NITROGEN AND PHOSPHORUS FOR THE ENHANCED GROWTH, YIELD, AND QUALITY COMPONENTS IN MUSTARD (Sinapsis arvensis L.) IN A SEMI ARID ENVIRONMENT
(2021-01-01) Sefaoglu F.; Erim E.; Toktay Z.; Ozturk E.
Mustard grows in many parts of the world thanks to its ability to adapt to different climatic conditions. It has the potential to be an important oilseed plant especially in the east of Turkey. There is scarcely any information available about fertilization in mustard cultivation in Turkey. Nitrogen and phosphorus fertilizers, a good source of nutrients for the soil, have a positive effect on the growth, development, and yield of the plant in case they are applied at the optimum level. This study was carried out in 2015 and 2016 with the purpose of examining the effects of nitrogen and phosphorus fertilization on the yield and agronomic characteristics of mustard. Five doses of nitrogen (0, 50, 100, 150, 200 kg ha-1) and phosphorus (0, 30, 60, 90, 120 kg ha-1) were tested. It was found that the nitrogen and phosphorus applications had significant effects on the plant growth, yield, and yield components in both 2015 and 2016. The characteristics examined within the scope of the study were significantly affected by the applications, and the oil content and seed yield increased with the increasing fertilizer doses. The results of the study emphasize the importance of fertilizer applications for the mustard plants grown in semi-arid climates. 200 kg ha-1 of nitrogen and 120 kg ha-1 of phosphorus were found to yield better results, and it was observed that the seed yield of mustard could be increased by increasing the doses of nitrogen and phosphorus.
Effect of organic and inorganic fertilizers, or their combinations on yield and quality components of oil seed sunflower in a semi-arid environment
(2021-01-01) Sefaoglu F.; Ozturk H.; Ozturk E.; Sezek M.; Toktay Z.; Polat T.
Producers in semi-arid and highland regions have difficulty in increasing diversity in crop rotations due to unfavorable conditions imposed by cool temperatures, inadequate rainfall, and shorter growing periods. In such conditions, some cultural practices that increase productivity such as fertilization appear as a promising alternative. Fertilization and the form of fertilizer have a substantial influence on sunflower (Helianthus annuus L.) seed yield and quality. The objective of this study was to determine the responses of the oilseed sunflower to organic (vermicompost and leonardite) and inorganic (nitrogen and phosphorus) fertilizers, or their combinations in a semiarid conditions. To this end, the field research was carried out in 2017 and 2018 in Erzurum, Eastern Anatolia, Turkey. In this study, it was found that the organic and inorganic fertilizers alone and their combinations significantly affected all the plant parameters. The highest seed yield (4854 kg ha-1) and oil yield (2114 kg ha-1) were obtained from the combined use of nitrogen and vermicompost. Moreover, the use of vermicompost alone yielded the highest oil content (46.8%). According to the results of this study, combined applications of organic (vermicompost) and inorganic (nitrogen) fertilizers had the highest yield and agronomic characteristics in oilseed sunflower production; so, these applications can be recommended for the similar ecological conditions, that is, short growing season and high altitude.
Evaluation of yield and yield components of some sugar beet varieties (beta vulgaris l.)in erzurum ecological conditions
(2019-01-01) Sefaoglu F.
This study was carried out in Erzurum ecologi-cal conditions between 2011 and 2012. The aim of the study was to evaluate the yield and yield charac-teristics of some sugar beet varieties. In this study, five sugar beet varieties (Aranka, Esperia, SR-374, Eldorado and Idaho) were used, and Root yields, sugar contents, sugar yields and dry matter contents were investigated. There were significant differ-ences (p <0.01) between the varieties in terms of in-vestigated characters. The highest root and sugar yield were in Eldorada (6899-1213 kg/da, respectively), and sugar content and dry matter content were in Idaho (18.9-22% respectively). As a result, Eldorada, which has the highest root yield per decare, and Idaho, which has the highest sugar content, can be recommended for Erzurum region.