TAILIEUCHUNG - Oxygen isotope discrimination of wheat and its relationship with yield and stomatal conductance under irrigated conditions
This study was carried out to determine the different irrigation regime effects on oxygen isotope discrimination of stem water (Δ18Os) and its relationship with grain yield (GY), aboveground biomass (BM), and stomatal conductivity (gs) of winter wheat. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2018) 42: 22-28 © TÜBİTAK doi: Research Article Oxygen isotope discrimination of wheat and its relationship with yield and stomatal conductance under irrigated conditions 1, 2 2 3 Sema KALE ÇELİK *, Sevinç MADENOĞLU , Bülent SÖNMEZ , Kadri AVAĞ , 4 5 5 6 Ufuk TÜRKER , Gökhan ÇAYCI , A. Cihat KÜTÜK , Lee K. HENG 1 Department of Irrigation, Faculty of Agriculture, Süleyman Demirel University, Isparta, Turkey 2 General Directorate of Agricultural Research and Policies, Ankara, Turkey 3 Soil, Fertilizer, and Water Resources Central Research Institute, Ankara, Turkey 4 Department of Agricultural Machinery, Faculty of Agriculture, Ankara University, Ankara, Turkey 5 Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Ankara University, Ankara, Turkey 6 Soil and Water Management and Crop Nutrition Section, International Atomic Energy Agency, Vienna, Austria Received: Accepted/Published Online: Final Version: Abstract: This study was carried out to determine the different irrigation regime effects on oxygen isotope discrimination of stem water (Δ18Os) and its relationship with grain yield (GY), aboveground biomass (BM), and stomatal conductivity (gs) of winter wheat. For this purpose a field experiment was conducted between 2009 and 2011 in a semiarid region of Turkey under rainfed (RF), deficit (DI), moderate (MI), and full irrigation (FI) conditions. The highest GY and BM ( t ha–1 and t ha–1) were measured from the FI treatment. However, the difference between the yield of DI and FI treatments was insignificant. It might be recommended that the DI treatment be used for wheat irrigation to increase water-use efficiency for semiarid climate conditions. Average Δ18Os values were obtained as ‰, ‰, ‰, and ‰ for RF, DI, MI, and FI treatments, respectively. Applied
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