Field experiments were conducted to determine the effect of different rates of N.P.K. Table 3 while in Table 4 was 114 kg, the yield has decreased by 26.25 kg. The result of this findings showed that eggplant requires N.P. K. (15:15:15) fertilizer at the rate of 148 kg/ha for maximum yield. This implies that fertilizer quantities can be varied to obtain optimal output. The result showed that yield of eggplant performance was better in plots that were applied fertilizer than in control plot. Based on the result of research findings, fertilizer application is economical in the production of eggplant fruit when the plant have produced enough roots. Younger eggplant should be treated with lower dosage of N.P.K. (15:15:15) fertilizer application and this could be increased as the plant get matured. The study also recommended that farmers who intend to produce eggplant at optimum level should applied N.P.K. (15:15:15) fertilizer about 10cm away from the base of each plant at the rate of 148 to 149 kg/ha at 13 weeks after transplanting. Extension agents should train eggplant farmers to adopt application of 129 kg/ha of N.P.K. (15:15:15) fertilizer applied gave fruit optimum yield of 130.25 kg of eggplant fruit at 10 WAT.
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