Determining the optimum irrigation intervals and plant densities for sunflower under drip irrigation system
2010
Moursi, E.A. | Kassab, M.M. | El-samanody, M.K.M.
Obtained data can be concluded as follows:_ Seed yield was dearly increased by decreasing irrigation interval where the highest means values were recorded under the shortest interval (4 days) and the values were 1.03 and 1.08 ton/ fed. (2.45 and 2.57 ton/ ha) in the first and second growing seasons, respectively. _ Mean values of 1000 seed weight (g) were increased under irrigation interval each 4 days in comparison with other irrigation intervals 8, 12, 16 and the lowest mean value was recorded under 20 days irrigation interval. _ In addition, data illustrated that the mean values of and head diameter was decreased by increasing irrigation interval up to 20 days _ The highest mean values of plant height were recorded under 8 days interval in the first growing season, and under 12 days, in the second growing. Also, data illustrated that by elongation irrigation interval up to 20 days caused decreasing amount of water applied was found, where the highest mean values were recorded under the shortest interval of irrigation each 4 days and respectively. On the contrary, the lowest values were recorded under the longest irrigation interval 20 days between watering .Concerning the values of water utilization efficiency (W.Ut.E) which dearly affected by irrigation interval where the highest values were recorded under the shortest irrigation interval each 4 days where, the values were 0.67 and 0.71 kg/ m. in the first and second growing seasons, respectively. Under the other irrigation intervals 8, 12, 16 and 20 days the values were low comparing with the first treatment (interval of 4 days) but there wasn't a standard and dear relationship between the other irrigation intervals (8, 12, 16 and 20) days. _ Data also illustrated that the highest mean values for oil content in seeds were recorded under 16 days between irrigation.
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