+44-7897-074717Ndukwe OO, Baiyeri KP
Globally, the utilization of passion fruit juice is on the increase because of the organoleptic, tremendous nutritional and biochemical qualities which can be influenced by fertilization among other factors. Hence, the study investigated the influence of combined application of organic and inorganic fertilizers (0, 10, 20 t/ha PM, 5 t/ha PM+200 kg/ha NPK 15-15-15, 10 t/ha PM+200 kg/ha NPK 15-15-15 and 400 kg/ha NPK 15-15-15) on the nutritional and biochemical qualities of fruit juice from two yellow passion genotypes (‘Conventional’ and KPF-4). Five matured, ripe and dropped fruits were directly picked under the yellow passion fruit vines which previously received the afore-mentioned fertilizers. Proximate and physicochemical compositions of fresh fruit juice from the fruits were assayed. Results were analyzed using split-plot design in completely randomized design, with genotype as main plot while fertilizer was assigned to sub-plots. Juice from Conventional genotype significantly (p<0.05) had highest crude fibre (0.495%), moisture (79.83%), K (2.61 mg/100 mL) and Na (1.318 mg/100 mL) with 10 t/ha PM+200 kg/ha NPK application. Highest juice pH of 3.91 (less acidic level) and total titratable acidity (8.223 mg/100 mL) were also produced in Conventional genotype with the application of 10 t/ha PM+200 kg/ha NPK. On the other hand, highest total ash (0.545%) and carbohydrate (20.62%) in juice from KPF-4 genotype were recorded with the application of either 10 t/ha PM+200 kg/ha NPK or 5 t/ha PM+200 kg/ha NPK. The addition of 5 t/ha PM+200 kg/ha NPK produced highest calcium (1469 mg/100 mL) and iron (97.49 mg/100 mL) concentrations but vitamin C was highest with either the application of 20 t/ha PM (29.04 mg/100 mL) and 400 kg/ha NPK (29.33 mg/100 mL). Lowest crude protein, crude fibre, percentage moisture, P, K, Na and Fe concentrations were ascribed to fruits that received no fertilizer. Tannin, saponin and phytate compositions in the juice were reduced by the application of 10 t/ha PM or 400 kg/ha, 10 t/ha PM+200 kg/ha NPK and 10 t/ha, respectively. The study therefore revealed that combined application of poultry manure and NPK fertilizers, especially 10 t/ ha PM+200 kg/ha NPK, can improve juice nutritional and biochemical qualities of yellow passion fruits. Further studies on the effect of other forms of organic and inorganic fertilizers combinations on juice qualities of passion fruit were recommended.
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