Biochemical characterisation of fruit juice from two yellow passion fruit genotypes as influenced by poultry manure rates

Abstract

The aim of this study was to investigate the influence of varying poultry manure rates (0, 10, 20, 30, 40 t ha(-1)) on the biochemical characteristics of fruit juice obtained from two yellow passion fruit genotypes (‘Conventional’ – Nigerian local genotype and ‘KPF-4’ – Kenya passion fruit number 4 – a hybrid). Five fresh fruits were picked directly from yellow passion fruit plants that previously received these five varying rates of poultry manure (PM). The fruit juices were assayed for composition, of nitrogen, phosphorus, potassium, calcium, magnesium, sodium, iron, zinc, physicochemical pH, total soluble solid, total titratable acidity, vitamins A and C, tannin, saponin, phytate, oxalate, flavonoid and phenol. The results were analysed using 2×5 split plot in completely randomized design with four replications. The ‘Conventional’ genotype had higher percentage crude protein and dry matter compositions but lower moisture content ‘than ‘KPF-4’. The crude fat, crude fibre, total ash and nitrogen free extract compositions were similar in both genotypes. The total ash increased progressively with increase in poultry manure rates. Juice from ‘Conventional’ had higher N, K, Na and acidity but lower Ca than ‘KPF-4’. Poultry manure significantly (p 0.05) influenced by genotypes and poultry manure rate. Poultry manure at 20 and 30 t ha-1 PM reduced the tannin and oxalate compositions, respectively. The study also indicated that juice from the ‘Conventional’ genotype had lesser phytochemical compositions than ‘KPF-4’. Both genotypes were similar in most phytochemical attributes while application of poultry manure at 20-30 t ha(-1) enhances these attributes.