LAUSR

ABSTRACT The aim of the study was to determine the yield and silage characteristics of maize hybrids (Burak, Efe and Şafak) under different irrigation levels designated as no irrigation (I0), irrigated 25% (I1), 50% (I2), 75% of I4 treatment (I3), and fully irrigated treatment (I4), irrigated when 40% of available water content consumed, in drainage-type lysimeters in 2012 and 2013. The results showed that irrigation treatments have a statistically significant effect on yield, dry matter, organic matter and protein content and silage quality components. The maximum fresh yield (86,238 kg ha−1 in 2012 and 90,063 kg ha−1 in 2013) was obtained from Burak hybrid I4 treatment. Irrigation amounts ranged from 100 to 721 mm in 2012 and from 105 to 712 mm in 2013. The treatments resulted in seasonal evapotranspiration of 190–746 mm and 208–751 mm in 2012 and 2013, respectively. On average, the highest water-use efficiency was found in I1 as 150.0 kg ha−1 mm−1 for Şafak hybrid, and the lowest one was found in I4 as 107.6 kg ha−1 mm−1 for Efe hybrid. Additionally, the lowest yield-response factor (0.81) was obtained from Şafak hybrid. It was concluded that Şafak hybrid is the most tolerant hybrid to water stress.