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Keywords:
Crop coefficient, Evapotranspiration, Irrigation, Sesame, Water productivity
The current study was conducted to determine the crop coefficient (Kc), evapotranspiration rate (ET), yield response factor to water stress (Ky), and water productivity (WP) of sesame under different irrigation water conditions in the 2018 and 2019dry seasons. In 2018, the experiment was conducted under a local lysimeter using sprinkler irrigation in a 100 m2 area, while the second experiment was laid out in RCBD with a factorial arrangement under furrow irrigation. In the second experiment, three sesame varieties, and four deficit irrigation treatments (100%, 80%, 60%, and 50% of field capacity) were applied. The plot size was 3mx4m, and the spacing of 1.5 m between blocks, and 1 m between treatments. The results indicated that the amount of evapotranspiration during the initial, development, mid, and late-season growth stages were 84, 189, 226, and 84 mm, respectively; while the average Kc values for the corresponding growth stages were 0.23, 0.66, 0.87, and 0.43. The seasonal Ky value of sesame was 0.83. Results on the WP of sesame indicated that the maximum WP of sesame (3.18 kg/mm) was obtained from Setit-1 under 315 mm of irrigation water (80% FC, and; the minimum WP (1.74 kg/mm) was obtained from Humera-1 under 225 mm of irrigation water (50% FC). The results obtained in this study demonstrated that the response of sesame to different water stress conditions was successfully determined. Hence the results can be used as a source of information for irrigation water management, irrigation scheduling, and crop improvement strategies; even though extra research under different locations, genotypes, and irrigation management is essential.
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The authors would like to thank the Ethiopian Agricultural Research Institute, Aksum University and the Ministry of Education for financially supporting this project. It is also a great pleasure to express our gratitude for Humera Agricultural Research Center for providing the necessary tools and equipment, seeds and fertilizer and irrigation during the dry season.