A field trial was conducted at the National Horticultural Research Institute, Ibadan, South Western Nigeria to assess the field performance and bunch quality of in-vitro propagated Pita 21 plantain variety under different rates of inorganic fertilizer. The experiment was laid out in a randomized complete block design with three replications. Treatments used were control (no NPK), 70kg/ha NPK 20: 10: 10, 150kg/ha NPK 20: 10: 10, 300kg/ha NPK 20: 10: 10 and 400kg/ha NPK 20: 10: 10. Data were collected at two-month intervals. Results showed that the treatments 400kg/ha NPK 20: 10: 10 fertilizer was the best in terms of plant height, number of leaves, stem girth and yield compared to the control. Yield was significantly (p<0.05) influenced by different rates of inorganic fertilizer. A yield of 4.95, 4.88, 4.42 and 4.05t/ha was obtained in 400kg/ha NPK 20: 10: 10, 300kg/ha NPK 20: 10: 10, 150kg/ha NPK 20: 10: 10, 75kg/ha NPK 20: 10: 10, and control respectively. The bunch qualities were evaluated via brix (%), pH, titratable acidity (%) and sugar-acid ratio. Brix(%) was significantly (P<0.05) influenced by different rate of inorganic fertilizer and it ranges from 12.5 22.5%. Treatment 300kg/ha NPK 20: 10: 10 recorded lowest brix indicating that fertilizer level reduced the sweetness of the plantain while control had the highest brix. pH values range from 4.5 4.8 and was higher in control when compared with treatment 300kg/ha NPK 20: 10: 10. Titratable acidity(%) range from 0.04 0.06. Control recorded lowest titratable acidity while treatment 300kg/ha NPK 20: 10: 10 had the highest value indicating that fertilizer level increased the acidity of plantain.
Field performance, Micropropagation, leaf area, yield.