Abstract

The response of some sunflower hybrids to seven irrigation treatments was studied in the field experiments during 2002 and 2003 seasons. Sunflower hybrids of Sanbro, Tarsan-1018 and Ozdemirbey were used as material. A rainfed (non-irrigated) treatment as the control (I0) and I1= irrigation at vegetative growth stage, I2= irrigation at heading stage, I3= irrigation at flowering stage, I4= I1 + I3 two irrigations, I5= I1 + I2 + I3, three irrigations, and I6= I1 + I2 + I3 + irrigation at milking stage were applied. Research revealed that average seed yield of all sunflower hybrids peaked with irrigations at all growing stages (I6). Increased water amount and irrigation frequency caused a decreasing in irrigation water use efficiency (IWUE) and an increase in irrigation efficiency (IE). Higher IWUE and lower IE were obtained from non-irrigated or one irrigation treatments. The highest IWUE (35.6 kg ha−1 mm−1) was obtained from Tarsan-1018 irrigated at vegetative stage (I1). Ozdemirbey irrigated with I6 gave the highest irrigation efficiency (IE) with 186%.

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