Verification of phosphorus calibration study on bread wheat was conducted in kofole district in 2019 which was based on calibration study output with objectives to verify the feasibility of the Pc and Pf determined during site specific soil test crop response based phosphorus fertilizer calibration and to create awareness on site specific fertilizer recommendation. Moreover, a composite soil samples at the depth of 0-20 cm in zigzag method were collected from 10 farmersâ€™ fields for Eutric Vertisols. Likewise, soil samples analyses were made to identify available P in the level of the required phosphorus in the select farmland for actual experiment. The treatments include soil test based phosphorus calibration result; farmersâ€™ practice in the area which was assessed from the surrounding farmersâ€™ and no fertilizer application (control) and each treatment was planted on 10*10m experimental plot & the design was randomized complete block design replicated over farmers. Ogolcho variety was used with seed rate of 150 kg ha-1and other cultural practices such as weed and rust management were used from which had been recommended for the area. The partial budget analysis showed that the highest net income (71630.48 ETB) from soil test based recommended and the lowest net benefit (44378.55 Birr ha-1) were obtained from control treatment respectively with marginal rate of return (653.38%) which is greater than the minimum rate of return (MRR) 100%. The result showed that the average grain yield of 4745 kg ha-1 was obtained from the application of soil test based phosphorus calibration (Pc and Pf) followed by blanket recommendation (3853 kg ha-1) and 2778 kg ha-1 for the control treatment. The optimum N which is 69 kg N ha-1 with soil test based phosphorus calibration (Pc and Pf) rate gave a 58.54% grain yield advantage over the control.
Keywords: Verification, Farmer, Concentration, Application and Available