Authors : Fatemeh Taheri Asbag , Abdollah Hasanzadeh Gorttapeh , Amir Fayaz-Moghadam , Maryam Saber-Rezaie , Farideh Feghnabi , Mosa Eizadkhah , Sharara Jahannavard , Simin Parvizi and Somyeh Naghi Moghadam-Pour
Abstract: Sunflower is one of the most cultivated oil crops in the world. In Iranian environments, where water deficit frequently occurs, early sowing and irrigation are used to overcome environmental constraints due to water scarcity. Since, in the literature, the data on the effect of these agronomic techniques on sunflower seed yield and yield component are essential and contrasting, the aim of this study was to evaluate the effect of the sowing time and the water regime on seed yield and yield component in Iranian environment. For this aim, 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 and its main component 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 Asbag , Abdollah Hasanzadeh Gorttapeh , Amir Fayaz-Moghadam , Maryam Saber-Rezaie , Farideh Feghnabi , Mosa Eizadkhah , Sharara Jahannavard , Simin Parvizi and Somyeh Naghi Moghadam-Pour , 2009. Effects of Planting Date and Irrigation Management on Sunflower Yield and Yield Components. Research Journal of Biological Sciences, 4: 306-308.