Filed experiment was carried out in land near Ramtha Wastewater Treatment Plant during growing seasons of 2010 and 2011 to determine the effects of using treated wastewater on plant growth, seed yield and yield components of sunflower (Helianthus annuus L.) under trickle irrigation. Randomized complete block design (RCBD) for three irrigation treatments namely; I1= Full irrigation (Actual crop coefficient), I2= 80% of full irrigation and I3= 60% of full irrigation randomized over three blocks. The application efficiency of trickle irrigation system was in the range of 88.2 to 90.8%. The applied irrigation water was 4990, 3992 and 2994 m3 ha-1 in 2010 and 5505, 4404 and 3303 m3 ha-1 in 2011 for I1, I2 and I3 irrigation treatments, respectively. Full irrigation treatment (I1) gave the highest plant height, head diameter, number of seeds plant-1, total weight of seeds plant-1, 1000 seeds weight, and seed and oil yield.
Key words: Sunflower production, water shortage, reclaimed wastewater reuse, oilseed crops.
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