Abstract
Field and laboratory experiments were carried out at the Barth Road Extension of the University of Ibadan Teaching and Research Farm to investigate the influence of N fertilization and storage conditions on the post-harvest changes in Corchorus olitorius (ewedu). Application of N significantly increased the ascorbic acid, N, Ca and P content in the leaves. Storage at room temperature (25–28°C) resulted in 93% loss in ascorbic acid content within 4 days. Under refrigerated storage, losses in ascorbic acid over a 4-week storage period were as high as 77%. Ca, P and N content increased slightly as storageperiod lengthened, probably due to dehydration. A dehydration experiment indicated that the faster the rate of moisture loss, the faster the rate of decline in ascorbic acid content. N, Ca and P contents were not significantly affected by any of the drying methods applied.
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