Two field experiments were conducted to study the
effect of irrigation intervals (without irrigation, 7,
14 and 21 days) and nitrogen levels (0, 15, 30, 45 and
60 kg N/fad.) on growth characters, yield components, yield
and chemical composition of sunflower (Hellanthus ius,
L.) var. Playak. Irrigation every 14 days significantly
effect increased all characters studied. Application of
nitrogen at 60 kg N/fad. increased significantly, plant
height, number of leaves, stem diameter, leaf area, head
diameter, weight of head, weight of 100—seed, seed yleld/
plant seed yield ton/fad. as well as oil yield kg/fad.
but oil content was significantly decreased.
The highest seed yield of sunflower could be actieved
by applying 60 kg N/fad. to the soil and/or irrigation
every 14 days.