Determination of Economically Optimum Nitrogen Fertilizer for Bread Wheat in Shashemene District, West Arsi Zone of Oromia, Ethiopia

Abstract

The objective of this study was to determine the bread wheat’s ideal level for nitrogen fertilizer applications on Eutric andosol. The treatments included phosphorus (0, 10, 20, 30, 40kg/ha) and nitrogen (0, 46, 69, & 92kg/ha) at four levels each in a factorial combined effect of complete block design with three replications. a 3m x 3m plot with a 150kg/ha seed rate  was used. Wheat variety called “Ogolcho” was applied to evaluate the treatments. The results from the analysis of variance demonstrated that there were significant differences (p 0.05) between all of the applied treatments. The application of 46kg/ha N and 92kg/ha P2O5 together resulted in the highest grain yield (5358kg/ha), while the lowest grain yield was obtained. at the control treatment.. However, there are no significant differences (p<0.05) between the combined effects of Nitrogen and phosphorous fertilizers levels above 46kg/ha on grain yield response. This implies that the application of N and P2O5 greater than 46kg/ha may not be economically important. Therefore, 69 N kg ha-1 N fertilizers was determined as economically feasible optimum N rates at 2655%, MRR on Eutric andosol in Shashemene district for Bread wheat.