Yazar "Önder, Sermet" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Different furrow management techniques for cotton production and water conservation in Harran Plain, Şanlıurfa(2012) Kanber, Rıza; Önder, Sermet; Ünlü, Mustafa; Tekin, Servet; Sezen, Semih Metin; Diker, KenanAbstract: In this study, the water saving and conservation potential of various furrow irrigation management techniques for irrigated cotton were compared. Conventional every-furrow irrigation with open-end furrows (EFO) and blockedend furrows (EFB), and alternate every-other-furrow management with open-end furrows (AFO) and blocked-end furrows (AFB), were considered. Considerable seasonal water savings were obtained with AFO and AFB fl ows, on average from 717 mm to 906 mm, respectively, when compared to EFO. Alternate furrows showed the ability to reduce tailwater runoff considerably. When compared with EFO, water use was reduced by 9063 m3 ha–1 (60%) using AFB and 7167 m3 ha–1 (48%) using AFO, with decreases in yield of 765 kg ha–1 (27%) and 492 kg ha–1 (17%), respectively. Similarly, average water use effi ciencies were 0.36 kg m–3 for AFB and 0.31 kg m–3 for AFO, compared to 0.20 kg m–3 for EFO. Results showed the possibility of applying alternate-fl ow furrow management techniques for water conservation in cotton irrigation. Additionally, the alternate furrow method could also be considered as a defi cit irrigation approach in the Harran Plain.Öğe Effects of water stress on plant growth and physiological characteristics of some grape varieties(Parlar Scientific Publications, 2014) Kamilo?lu, Önder; Sivritepe, Nuray; Önder, Sermet; Da?han, HaticeThe objective of the present study is to investigate the physiological, morphological and structural changes induced by water deficit on four different table grape culti- vars that are commonly cultivated in the Mediterranean region. One-year-old vine (Vitis vinifera L.), cultivars 'Crimson Seedless', 'Superior Seedless', 'Razaki' and 'Horoz Karasi' grafted onto 1103 P rootstock were grown in a greenhouse in a soil/farmyard manure/sand/turf mixture (2:1:1:0.5) in pots; and subjected to water stress for 40 days. A 60% limitation of the available water caused total leaf area and dry weight decrease as well as negative impact on growth in all cultivars. As a result of this application, a distinctive decrease in root growth was observed in the Crimson Seedless, Superior Seedless and Razaki cultivars, in comparison with the control. While there was no significant change in grade of leaf thickness, leaf tissue density, or leaf succulence during water stress application, increases in leaf K, Fe, Cu, and Zn contents, chlorophyll content, and leaf electrolyte leakage were observed. Significant differences were seen among the grape cultivars in terms of adaptation to aridity conditions. Generally, the most sensitive grape cultivar in terms of tolerance to water stress was Superior Seedless, whereas the cultivar that can optimally adapt to conditions of higher aridity was Horoz Karasi. © by PSP.Öğe Phytoremediative potential of tobacco under deficit irrigation conditions for Ni-polluted soil(HARD Publishing Company, 2014) Dağhan, Hatice; Uygur, Veli; Önder, Derya; Önder, SermetThe aim of this study was to investigate the possibility of reclaiming Ni-polluted soils by phytoremediation under deficit irrigation conditions. Tobacco, Nicotiana rustica, was grown for 6 weeks at four different irrigation rates (100, 80, 60, and 40% of irrigation requirement) and four nickel concentrations (0, 50, 100, and 200 mg Ni?kg-1 soil) applied from NiSO4. Nickel toxicity, water stress symptoms, dry shoot biomass, Ni concentration, and Ni uptake were followed. Neither Ni treatment nor water stress-induced Ni toxicity were observed, and there was no treatment-induced difference in chlorophyll content of leaves. With the increasing Ni application, there was a gradual increase in Ni concentration of the shoots from the 40% irrigation through 100% irrigation. As a result, the ability of tobacco to accumulate Ni at high concentration can enable it to be used for phytoremediation of Ni-polluted soils despite the fact that water deficit limits Ni accumulation to some extent. © 2014, Polish Journal of Environmental Studies. All Rights Reserved.Öğe The use of aridity index to assess implications of climatic change for land cover in Turkey(2009) Önder, Derya; Aydın, Mehmet; Berberoğlu, Süha; Önder, Sermet; Yano, TomohisaThis study was carried out to determine the impacts of climate change on aridity and land cover in Turkey. Data for future (2070s) climate change, according to present conditions (1990s), were estimated from the prediction results of a regional climate model (RCM). The RCM, which was developed in Japan, is based on the MRI model. The potential impacts of climate change were estimated according to the A2 scenario of Special Report on Emissions Scenarios (SRES). Aridity index, the ratio of precipitation to potential evapotranspiration, was computed by using measured data for the present condition and estimated data by the RCM for the future years. Changes in aridity were evaluated by comparing the current and future index values. Aridity variables were interpolated to determine the spatial distribution by means of geostatistical methods. Land cover was modelled and mapped by using the present and future aridity index data. In the southern regions of Turkey, especially along Mediterranean coasts, projected precipitation for 2070s will be 29.6% less than the present. On the contrary, an increase (by 22.0%) in precipitation was projected along the coast of Black Sea. The model predicted that the temperature might increase by 2.8-5.5 °C in the different regions of the country. This increase in temperature could result in higher evaporative demand of the atmosphere in the future (on the average 18.4 and 22.2% in the Mediterranean and Black Sea coastal regions, respectively and 17.8% in the whole country). Thus, an increase in aridity was foreseen for the whole Turkey except the north-eastern part. A conversion of deciduous broadleaf forest to evergreen needle-leaf forest is predicted in the northern coastal areas when we compare the future land cover with the present situation. The mixed forest vegetation could spread in the interior parts of East Anatolia and the north-western part of the country in the future.
