Authors : Fatemeh Taheri Asbagh , Amir Fayaz Moghddam and Abdullah Hassanzadeh Gorttapeh
Abstract: The effect of water stress and sowing date on yield and oil percentage has been studied in sunflower (Helianthus annuus L.). For this purpose, one standard hybrid (Euroflor) sown in spring at the 3 different dates were cultivated in Western Iranian under 5 water regimes, viz I1, IW/CPE (irrigation water: cumulative pan evaporation) ratio 0.6. I2, at 25 days after sowing + flower-bud initiation; I3, at 25 days after sowing + complete flowering; I4, at 25 days after sowing + seed filling; I5, at 25 days after sowing + complete flowering + seed filling in 2007. Yield, its main component and oil percentage were positively affected by irrigation and by the earlier sowing date. At early sowing date the yield and yield components showed notable increase. The increase in these parameters observed also in supplementary irrigation.
Fatemeh Taheri Asbagh , Amir Fayaz Moghddam and Abdullah Hassanzadeh Gorttapeh , 2009. Influence of Water Stress and Sowing Date on Sunflower Yield and Oil Percentage. Research Journal of Biological Sciences, 4: 487-489.