Determination of Optimum Irrigation Water Requirement of Wheat at Sayo District, Kellem Wollega, Oromia

Ethiopia needs 70-80 million quintals of wheat to feed 110 million people, but imports are a significant deficit. The government has implemented food and wheat security measures, including yield gap closure, area expansions, and irrigation. Wheat is a strategic commodity for Ethiopia's food security, agroindustry, import substitution, and job creation. An experiment was conducted at Dambi Dollo University campus in Sayo District, Kellem Wollega Zone, to determine wheat irrigation water demand. The study evaluated five irrigation depths in wheat cultivation, using soil parameters, meteorological data, and crop characteristics. The results showed that 90% of the net water requirement of wheat is optimal for normal physiological activities, including evapotranspiration and metabolic activities. The saved water, 10% of the total 191.9 mm, can be used to irrigate more command areas and prevent abandonment. The water productivity value of irrigated wheat is within the range of previous findings, and the average wheat yield is improved under irrigation conditions even in Ethiopia. The efficiency parameters (GY, WUE, and WP) generally perform significantly. The study recommends extension services to demonstrate this finding on farmers' fields for further evaluation and popularization, and Zonal/District Agricultural Offices to use this 172.71 mm to sustainably boost irrigated wheat production.