RESUMEN
This experiment was carried out during the 2000 and 2001 growing seasons at Akad horticulture stations. Shatra, Thi-Qar-governorate. The study was conducted to investigate the influence of plowing depth, irrigation intervals and planting data on growth and yield of sunflower. Split-Split-plots arrangement in randomized complete block design with four replicates was used. The main treatment was irrigation intervals [6;9 and 12] days where as the plowing depth [0-200] and [0-40] cm was used as sub treatment, while the planting dates [26. feb, 13 March, and 28 March] was used as sub-sub treatment. The area of exp. Unite was [3x3m] contained [4] rows, planning at [75x30cm] space. The results have shown the plant height, leave index, head diameter, number of seeded/head, weight of 1000 seeds, and yield seed [ton/ha] and significantly effected by the study factors. The results of the statistical, analysis of the data showed that shortest irrigation interval [6days] increased the yield of seed by 24 and 28 percent as compared to longest irrigation interval [12 days] for the 2000 and 2001 seasons. The early planting date [26. Feb.] had significantly increased the yield of seed by 40 and 42 percent as compared to planting date [28. March] during two study seasons 2000 and 2001. Also the interaction of plowing depth with irrigation intervals had significantly increased the yield of seed sunflower which was 3.052 and 2652 [ton/ha] for the combination of deep plowing was with short interval [6 days] for 2000 and 2001 seasons. There for the interaction of deep plowing with planting date had significantly increased the yield of seed which was 3.200 and 2.755 [ton/ha] for the combination of plowing depth with early planting date [26. Feb] for 2000 and 2001 seasons. The study showed that the combination of irrigation interval [6 days] with early planting date [26. Feb] increased the yield of seed which was 3.067 and 2. 645 [ton/ha] for 2000 and 2001 seasons. The beast combination was [6 days x 26.Feb. x deep plowing] due to the highest grain of seed which was 3.467 and 3.022 [ton/ha] for 2000 and 2001 seasons