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  • Küçük Resim
    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, Kenan
    Abstract: 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.
  • Küçük Resim
    Öğe
    Effect of irrigation strategies on yield of drip irrigated sunflower oil and fatty acid composition and its economic returns
    (Ankara Üniversitesi, 2019) Sezen, Semih Metin; Tekin, Servet; Bozdoğan Konuşkan, Dilşat
    A field trial was conducted to observe the effects of different irrigation strategies on the yield and the water use, oil content and marginal return of sunflower which was irrigated by means of a drip system during 2010 and 2011 under Çukurova condition of Turkey. The irrigation strategies include three irrigation intervals (A1 : 25 mm; A2 : 50 mm; A3 : 75 mm of cumulative pan evaporation) and six water levels (WL) based upon the percentages of cumulative pan evaporation (WL1 = 0.50, WL2 = 0.75, WL3 = 1.00 and WL4 = 1.25). In addition, WL5 = PRD50 and WL6 = PRD75 treatments were evaluated. They obtained water from alternative laterals 50% and 75% of the WL3 treatment. Additionally, a nonirrigated treatment (NI) was included as control plot in the experiment. In each of the experimental years, the largest and the smallest average yields were acquired from the A2 WL4 and NI treatments, respectively. The oil content and fatty acid composition were significantly affected by irrigation strategies. The oil content increased with the increasing amount of irrigation. Among all irrigation intervals, PRD-50 (WL5 )treatment provided the largest water use efficiency (WUE) and irrigation water use efficiency (IWUE) values in both growing seasons. In order to attain higher yields and a generated the marginal return, A2 WL4 irrigation regime is suggested for sunflower production in the Mediterranean region. A2 WL3 water strategy is proposed for an acceptable marginal return in case of water shortage.