Yazar "Tas, Ismail" seçeneğine göre listele

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    The effect of climate change on stream basin hydrometeorological variables: The example of Dim Stream (Turkey)
    (European Regional Centre Ecohydrology Polish Acad Sciences, 2024) Atilgana, Atilgan; Yuecelb, Ali; Kocieckac, Joanna; Rolbieckid, Roman; Senyigite, Ulai; Tas, Ismail; Markovic, Monika
    Climate change is causing serious problems in various economic sectors in particular involving water management. For this reason, it is extremely important to conduct research to identify climate change trends and better understand them. This study was carried out in the Dim Stream basin in the Western Mediterranean region (Turkey), which is particularly vulnerable to climate change. The study used flow data from two flow observation stations (FOS) and meteorological records such as wind speed, average flow, precipitation, temperature, evaporation, radiation, and relative humidity for 1984-2017. These data showed the changes between flow and hydrometeorological variables using linear regression analysis, coefficient of variation, t-test and correlation analysis. It has been determined that there has been a rapid decrease in the average flow of the FOS number 09006 since 1995 and the average flow of the FOS number 09-013 since 1999. Also, it was demonstrated that the average relative humidity (RHave), ave ), average temperature (Tave), ave ), average precipitation (Pave), total precipitation (Pt) and maximum precipitation (P max ) meteorological variables were most affected by climate change in the basin. Furthermore, it was found that the most changes were Qy ave (67.60%), T m i n (48.23%), P max (36.43%), P ave (33.91%), Pt t (33.90%), and RH ave (2.63%) in FOS numbered 09-013. Moreover, it was concluded that climate change variability had developed trends towards a rapid decrease in the flow values at the flow observation stations in Dim Stream. These results show that plans and measures for the efficient and sustainable management of water resources in this region must be implemented immediately.
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    Öğe
    The Effect of Drip Irrigation and Nitrogen Levels on the Oil and Fatty Acid Composition of Sesame and Its Economic Analysis
    (Mdpi, 2024) Tas, Ismail; Akcura, Sevim; Kaplan, Mahmut; Jagosz, Barbara; Atilgan, Atilgan; Kociecka, Joanna; Rolbiecki, Roman
    One of the oldest oilseed crops is sesame, which is mainly cultivated due to its valuable oleic/linolenic fatty acid ratio. The application of precise irrigation and fertilisation is crucial to ensure the continuity and productivity of sesame production, especially in arid and semi-arid regions. This study aimed to determine the effect of drip irrigation and nitrogen levels on sesame's oil and fatty acid composition. For this purpose, four nitrogen doses (N0: 0 kg ha-1, N30: 30 kg ha-1, N60: 60 kg ha-1 and N90: 90 kg ha-1) and three different irrigation water levels (I50, I75 and I100, which correspond to 50, 75 and 100% evaporation levels from the evaporation of the Class A pan) were applied. The highest oleic acid content (43.06%) was obtained for the I75N90 treatment. In the case of linoleic fatty acid, the greatest value (43.66%) was for I50N0 treatment. The effects of irrigation and nitrogen doses on oleic acid and linoleic acid content were inverse of each other. An increase in applied irrigation water increased the linoleic acid content. However, it caused a decrease in oleic acid content. Increasing the nitrogen dose increased the oleic acid content and caused a decrease in linoleic acid content. Furthermore, this study showed that the I50N60 treatment (50% Epan and a rate of 60 kg N ha-1) is the most effective for achieving high grain and oil yields in sesame cultivation. The results obtained provide practical guidance for farmers in sesame cultivation.