Oil yield, fatty acid profile, achene yield and yield attributes of sunflower (Helianthus annuus L.) as influenced by autumn planting conditions in Islamabad

摘要

Field experiment was conducted at National Agricultural Research Center, Islamabad during autumn, 2009, to explore the role of temperature on oil contents, fatty acids composition and heat units accumulation of local sunflower hybrids. Fourteen sunflower hybrids (Hysun-33, SMH-9902, SMH-9903, SMH-9904, SMH-9905, SMH-9906, SMH-9908, SMH-9909, SMH-9910, SMH-9911, SMH-9912, SMH-9913, SMH-9914, and SMH-9915 were sown in randomized complete block design with 4 replications under field conditions. Significant variation (p0.05%) was found among the sunflower hybrids for oil contents, oil compositions, heat units accumulation, yield and yield components. Significantly highest oil contents and oil quality (highest linoleic acid %) were recorded by sunflower hybrid SMH-9914. On average Hysun-33, SMH-9910, SMH-9902 and SMH-9912 performed best for plant height, head diameter and achene yield Kg ha-1. It was concluded from the above study that the hybrids which accumulated higher heat units were late maturing, but hybrids with lesser heat units were early maturing. It was also inferred that the temperature positively influence the oil quality of sunflower hybrids under autumn planting conditions.