Yazar "Çakir, Recep" seçeneğine göre listele

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    Irrigation scheduling and water use efficiency of cucumber grown as a spring-summer cycle crop in solar greenhouse
    (Elsevier B.V., 2017) Çakir, Recep; Kanburoglu-Çebi, Ulviye; Altintas, Surreya; Ozdemir, Aylin
    This 3-year study aimed to determine the most appropriate irrigation application and water use efficiency programs based on Class A Pan evaporation for mini (Lebanese) type cucumber plants grown as a first crop under protected conditions in a solar greenhouse. Research was carried out in an unheated solar greenhouse constructed on the lands of Ataturk Soil Water and Agricultural Meteorology Research Institute in Kirklareli, Northwestern Turkey. In order to prevent excessive increase in temperature within the protective structure, the semicircular shaped unheated greenhouse with sidewall ventilation was screened with 75% green-coloured shading net. The experimental layout of the study was a split-plot design with 3 replications. Two irrigation intervals (D1–2 days and D2–4 days) and four different plant–pan coefficients (0.75, 1.00, 1.25 and 1.50) were applied to main and subplots in the experiment. It was determined that cucumber yields increased with the increase in the irrigation water amount and reached averages of 128.2 and 126.5 ton ha?1 with use of highest plant pan coefficients of 1.50 and 1.25 vs. 90.7 and 90.9 ton ha?1 under the lowest Ecp coefficient of 0.75. The highest irrigation water use efficiency (IWUE) and water use efficiency (WUE) values of about 56 kg ha?1 m?3 and 42 kg ha?1 m?3 were obtained from the conditions with least applied irrigation water amounts. The average seasonal value of the yield response factor (ky) estimated on the basis of data from the 3-year study was determined as 0.75. © 2016 Elsevier B.V.
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    Irrigation water management for sprinkler irrigated corn using rooting data obtained by the minirhizotron technique
    (2012) Yavuz, Muharrem Yetis; Çakir, Recep; Kavdir, Yasemin; Deveciler, Merve; Bahar, Erdem
    The research, aiming to evaluate possibilities for irrigation scheduling of corn using root development data obtained by minirhizotron technique, was carried out during 2008 and 2010 on experimental fields belonging to Çanakkale Onsekiz Mart University. Line source sprinkler irrigation was applied for irrigation of the experimental plots and irrigation water amount determination was based on water deficits of the actual effective root depth obtained prior to the irrigation application using the minirhizotron technique. Results of the 2 year study show that the effective root depth of the crop is around 70-75 cm until the 3 rd or 4 th irrigation application. Using data for root development restricted overwatering and excessive water loss compared to 90 cm root depth traditionally assumed for corn irrigation in the region. The highest grain yields were obtained from the treatment under favorable moisture conditions and yield decreased with increasing distance from the sprinkler irrigation lateral. There a linear relationship between seasonal evapotranspiration rates and grain yield, and seasonal evapotranspiration deficit and relative yield reduction, during each of the experimental years. Average value of the yield response factor (ky) for the research period was 1.34. © 2012 Friends Science Publishers.
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    Water holding properties and soil water types in fine textured vertisol soils of thrace region in turkey
    (Polish Academy of Sciences, 2019) Çakir, Recep; Cangir, Cemil
    The study was carried out on 16 selected model soil profiles, located on lands covered with soils exhibiting vertic properties in Thrace Region of Turkey. Different horizons and/ or sub-horizons of 16 characteristic soil profiles were evaluated in field or laboratory conditions in terms of water holding capacity and water types properties. Total of 105 soil samples were analyzed for routine physical characteristics. Soil water holding capacity was determined applying negative potentials (?) of -0.33 bar, -15.5 bar and -31.5 bar (pF 2.54; 4.2 and 4.5), using a pressure-membrane extraction apparatus. In addition to gravitational, available, unavailable and hygroscopic soil water types, the soil samples were investigated also in terms of crystal-lattice water content. The highest amounts of the listed water types were determined in soils of Büyük Mandira, Türkgeldi and Seymen containing the highest rates of smectite clay mineral. The mass percentage (Pw) rates of the mentioned water types of the investigated profiles varied in the ranges of 29.1–66.3%, 10–2.15%, 22.0–32.4%, 6.0–9.0% and 5.6–8.6%, respectively. Though the mass percentages of enumerated water types in the soils of Osmanli and Yeni Mahalle, all owning high sand and lower clay content on the other hand, are between 28.9–40.6%, 6.1–15.5%, 7.4–16.8%, 2.4–4.8% and 1.7–4.4%, respectively. © 2019, Polish Academy of Sciences. All rights reserved.