Browsing by Author "Kekec, Ugur"

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A Comparative Field Study of the Alternate Every Other Furrow Surge Irrigation and the Every Furrow Surge Irrigation Techniques
(Wfl Publ, 2013) Kapur, Burcak; Unlu, Mustafa; Kanber, Riza; Tekin, Servet; Koc, Deniz Levent; Kekec, Ugur
This study was conducted in order to compare the alternate every other furrow surge irrigation (AFO) to the every furrow surge irrigation (EFO), under Mediterranean conditions in Turkey at the Cukurova University experimental farm. The experiment was undertaken in order to determine the appropriate throughput at furrow lengths of 110 m. In general, depending on the water flow (0.87-1.16 L/s) and the duration of the irrigation application (228-272 min), there may be differences on the amount of water under the same flow rates with the use of similar forms of operating furrow application of the AFO, which was determined to be more advantageous than the application of the EFO. The application efficiencies were quite similar by 78% in the EFO and 84% in the AFO, respectively. The reason for these high efficiencies was found to be due to the lacking irrigation application concerning the time of irrigation and the rate of water flow. Significant water savings were achieved by AFO compared to the EFO technique in the field by using the furrows in turns at each irrigation operation. The average soybean yields for both two years were 252 kg/da for the EFO and 259 kg/da for the AFO application. The results of the experiment revealed that the AFO furrow irrigation technique was the appropriate surface irrigation technique for the studied area.
Irrigation Scheduling of Grapefruit Trees in a Mediterranean Environment Throughout Evaluation of Plant Water Status and Evapotranspiration
(Tubitak Scientific & Technological Research Council Turkey, 2014) Unlu, Mustafa; Kanber, Riza; Koc, D. Levent; Ozekici, Bulent; Kekec, Ugur; Yesiloglu, Turgut; Ben-Gal, Mon
In this study, 1 full irrigation regime (100% of crop evapotranspiration, I100) and 2 deficit irrigation regimes (70%, I70, and 50%, I50) were evaluated in a Rio Red grapefruit (Citrus paradisi Macfad. 'Rio Red') orchard in Adana, Turkey. Fruit yield, leaf water potential (LWP), and soil water depletion (SWD) were measured among trees from each treatment. Actual evapotranspiration was calculated in 3 ways, using 2 energy balance methods (eddy correlation and Bowen's ratio) and water balance. Evapotranspiration rates of I70 and I50 treatments were 10% and 18% less than I100, respectively. Average irrigation amount for I50 was less than half of the average irrigation amount for I100. Considering that yield for the experimental treatments did not change statistically significantly, the I50 treatment provided about 50% more irrigation water savings than full irrigation conditions. Grapefruit tree LWP was highly correlated to soil water status and significantly associated with irrigation treatment. Average LWP values for treatments were -2.70 MPa for I100, -2.96 MPa for I70, and -3.28 MPa for I50. LWP increased up to a threshold level equivalent to 60%-66% of SWD, above which LWP decreased linearly with a continuous increase of SWD. This indicates that an average LWP of 3.28 MPa can be allowed for grapefruit under these experimental conditions while keeping the crop yield at that of full irrigation levels. The research findings showed that an enhanced understanding of physiological parameters is essential for irrigation scheduling of fruit plants. These will result in obtaining the optimum yield of fruit while conserving water.