No abstract

A field experiment was carried out on nitisols of Hidebu Abote district, North Shewa Zone, Oromia where wheat production is severely constrained by lack of an appropriate rate and types of fertilizer recommendation to evaluate wheat crop response to NPK fertilizer application. Fifteen NPK nutrients levels were considered and applied as treatments along with control (no fertilizer) at yaya Deka Bora peasant association were arranged in randomized complete block design (RCBD) with three replications at two farmers field. The ANOVA result indicated that plant height (PH), above ground biomass yield (AGBMY), straw yield (SY), Thousand grain weight (TGW), grain yield (GY) and harvest index (HI) of bread wheat showed significant (P ≤ 0.05) response to the NPK fertilizer application at both sites. The highest AGBMY (13.61 and 12.46 tons ha-1), SY (8.13 and 7.33 tons ha-1) and GY (5475.00 and 5414.33 kg ha-1) were recorded with the application of 69:30:20 NPK fertilizer combination at (site 1 and site 2) respectively and the lowest were recorded on control treatments. However the highest PH (103.8 and 97.27 cm) at site 1 and site 2 was recorded respectively with the application of 92:10:20 NPK nutrients combinations. Both the statically and economical analysis showed that 69:30:20 NPK kg ha-1 of fertilizer application results in higher yield and economically profitable for bread wheat production in the study area. However further research experiment with multi locations, cropping seasons and different bread wheat cultivar have to be required in order to give best conclusive recommendation for the farmers.

Farmers are using NPS fertilizer rates in the area without any recommendation of crop response to the respective fertilizers This experiment was conducted to evaluate the effect of NPS fertilizer rate for higher yield of bread wheat in Wachale district. The experiment consisted six rates of NPS fertilizer rate supplemented with 92 kg N ha -1 laid out in RCBD with three replications. Improved variety of bread wheat Danda'a was used. The analyzed result indicated that, plant height and wheat grain yield were significantly (P<0.05) influenced by NPS fertilizer rate. The highest (94.56 cm) plant height was recorded from the application of 100% P-critical in NPS fertilizer rate and the lowest (63.62 cm) plant height was recorded from unfertilized plot. The highest (2833 kg ha -1 ) grain yield was obtained from the application of 100% P-critical in NPS fertilizer rate and the lowest (888 kg ha -1 ) grain yield was obtained from unfertilized plot. Partial budget analysis showed that the highest net benefit (53401.51 ETB ha -1 ) and marginal rate of return (MRR) (1093.80%) were obtained from the fertilizer application of 100% P critical in NPS fertilizer). Therefore, 100% equivalent rate of NPS fertilizer rate in relative to determined critical phosphorus supplemented with 92 kg N ha -1 for bread wheat could be recommended and thus soil test based crop response phosphorus fertilizer recommendation with 92 kg ha -1 of Nitrogen could be demonstrated and further scaled up for Bread wheat in Wachale district.