Abstract            Volume:10  Issue-2  Year-2022         Original Research Articles

Online ISSN : 2347 - 3215 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcret@gmail.com

The drive for higher agricultural production without balanced use of fertilizers created problems of soil fertility exhaustion. Inorganic fertilizers have been an important tool to overcome soil fertility problems and are also responsible for a large part of the food production increases. The study was conducted at Bulesouthern, Ethiopia, and aimed to determine the optimum level of NPS-B blended fertilizers by supplementing N from urea rates for maximum yield of bread wheat production and to determine the economically optimum level of NPS-B and by supplementing N from urea fertilizer. The treatments were: (100 kg ha^-1 NPSB + 150 kg ha^-1 Urea), (150 kg ha^-1 NPSB + 150 kg ha^-1 Urea), (200 kg ha^-1 NPS + 150 kg ha^-1 Urea), (250 kg ha^-1 NPSB + 150 kg ha^-1 Urea), (100 kg ha^-1 NPSB + 250 kg ha^-1 Urea), (150 kg ha^-1 NPS + 250 kg ha^-1 Urea), (200 kg ha^-1 NPSB + 250 kg ha^-1 Urea), (250 kg ha^-1 NPBS + 250 kg ha^-1 Urea), (100 kg ha^-1 NPSB + 350 kg ha^-1 Urea), (150 kg ha^-1 NPSB + 350 kg ha^-1 Urea), (200 kg ha^-1 NPSB + 350 kg ha^-1 Urea), (250 kg ha^-1 NPSB + 350 kg ha^-1 Urea), control and R-NP (69N and 20P). The treatments were arranged in a randomized complete block design and replicated three times. The maximum on biomass yield (13994.0kg ha^-1), grain yield (6990.6kg ha^-1), and straw yield (76201 kg ha^-1) were obtained from the application of 200 kg ha^-1 of NPSB and 250 kg ha^-1 of Urea and followed by recommended NP fertilizers and of 250 kg ha^-1 of NPSB and 250 kg, ha^-1 of Urea were superior to all of the other treatments. However, the lowest above-ground biomass, grain, and straw yields were obtained from control or unfertilized plot. The economic analysis revealed that the highest net benefit of 178860.4 ETB ha^-1 with a marginal rate of return (MRR%) of 309.0 % was obtained in response to the application of 200 kg ha^-1 of blended NPS-B with 250 kg ha^-1 of Urea. However, the lowest net benefit was obtained from an unfertilized or control plot. Therefore, applications of 200 kg ha^-1 NPSB of blended plus 250 kg ha^-1 of urea is economically advisable for farmers in the Bule districts southern, Ethiopia and areas with similar agro-ecological and soil conditions for better bread wheat production.

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