Abstract:

To avoid over or under-irrigation, it’s critical to estimate the water consumption of the crop appropriately. In the Oda Bultum District of Eastern Oromia, the study’s goal was to ascertain and validate the crop water requirements of tomatoes, onions, and hot peppers for appropriate management under surface irrigated conditions. The CROPWAT simulation, which utilizes the FAO-Penman Monteith approach, it served as a basis for determining the required water quantity for irrigation for each crop and the reference crop evapotranspiration using the 30-year climate data obtained from the Ethiopian National Meteorological Institute. The research showed that harvested water necessity and irrigation water requirement of onion, tomato, and hot pepper with a developing time of 135, 120 and 135 days require 409 and 398 mm, 412 and 358mm, and 589.8 and 422.3 mm, respectively, of water during the slow time of year and yield water requirement. Planning district-wide water management techniques for the chosen crops and avoiding excessive or insufficient irrigation may benefit from this study. These outcomes can be utilized for arranging and the most effective water need and improve cultivation of the onion, tomato, and hot pepper in the research area. This research could help avoid excessive or insufficient irrigation and support the development of effective water management plans for the chosen crops in the district.