ادم, منى2024-10-232024-10-232019https://dspace.omu.edu.ly/handle/123456789/407Two field experiments were conducted at the coast region of El-Hania in Al Jabal Al Akhdar area during the two growing seasons 2015-2016 and 2016-2017 to investigate supplemental irrigation on crop growth stages (seedling growth; tillering stage and beading stage) compared with rainfed, also, effect of salicylic acid (SA) at certain stages (elongation and the stem and flag leaf growth) compared with the control. Strip plot design were used in this experiment, both ways of irrigation and sub plot of (SA) of an area 12 m 2 , four replicates were used. Results of this study showed that: 1. Differences between both types of irrigation in all growth traits of leaf area index, crop growth rate, lead chlorophyll a, band total contents, net assimilation rate and water use efficiency were not significant. Meanwhile, spraying (SA) showed significant differences, the greatest in flag leaf comparing with control in both two seasons. Spraying (SA) showed no significant differences between seasons in leaf (chla) contents and other traits. 2. Yield components including plant height, bearing tillers m-2 ; spike characters (length, weight, number and weight of grains) were significantly increased with supplement irrigation. Moreover, spraying (SA) during flag laef growth showed high significant increase in both seasons. 3. In supplement irrigation, there were significant increases in biological yield with 6.78 and 13.90 t/ha-1 in both seasons, respectively. Whereas in rainfed showed 6.40 and 12.30 t/ha-1 and with spraying (SA) 7.01 and 13.60 t/ha-1 , in both seasons, respectively, during flag leaf growth compared with control 6.07 and 12.52 tha-1 in both the two seasons, respectively. Abstract 64 4. There were significant increases in grain yield with 2.07 and 5.09 t/ha-1 in supplement irrigation in both seasons, respectively, comparing with rainfed which showed 1.62 and 4.36 tha-1 . In addition, significant increase was showed in grain yield 2.01 and 4.93 tha-1 and that because of (SA) spraying during flag leaf growth and compared with control which was 1.71 and 4.54 tha-1 in both seasons respectively. 5. No significant effects of straw yield in supplement irrigation within first season, while significant effects in the second season, which were 8.77 t/ha-1 in regular irrigation compared with 7.94 t/ha-1 in rainfed and 8.71 tha 1 in (AS) in flag leaf spraying and the control was 7.98 tha-1 . 6. In the first season, harvest index showed significant differences, the highest was in the regular irrigation in heading time, and in spraying (SA) at flag leaf generation. 7. One thousand grain weight was not significant neither in irrigation or (SA) application in both seasons. 8. In all drought inefficiency involved, Harmonic mean (HM); SDI (Sensitive drought index); TDI (tolerance drought index), MP (mean of productivity under drought) SDT (stress drought tolerance) and irrigation efficiency under drought were not significantly different from supplement irrigation and (SA) spraying, except HM in the first season and SDT in 2nd seasons . 9. In all the effect of interaction of supplement irrigation x (SA) spraying were not significantly affected because independent effects of one factor to the other in both seasonsThesis