Effects of various storage methods on the quality and nutritional composition of sweet potato (Ipomea batatas L.) in Yola Nigeria

The effects of five different storage methods on the quality and nutritional composition of sweet potatoes was studied between December 2006 and May 2007 at Federal University of Technology Yola using randomized complete block design. The methods used for the study are modifications of existing methods that are used in Nigeria and elsewhere to suit local climatic conditions. Pits of 50X50X70 cm were dug and storage conditions varied. In each case 20 kg of freshly harvested and cured potatoes were stored. The samples were analyzed for moisture, protein, starch, and vitamins A and C before storage. Data were collected every month for five months on percent weight loss, sprouting, spoilage and other physiological changes. The samples were again analyzed for moisture, protein, starch, Vitamins A and C at the end of the five months storage period. Data collected were analyzed using the GLM procedure of SAS version 9.2 and means that were significant were separated using LSD method. Results showed significant differences among the various treatments. It was concluded that two storage methods moist sawdust in wooden box and pit storage with layer of river sand have good potentials for storage of sweet potatoes in Yola for up to five months without serious change in nutrient content and could therefore be recommended to farmers.