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Storage studies on sweet potato roots: experiences with KSP20 cultivar.

Karuri, E. G.; Ojijo, N. K. O.;

Acta Horticulturae Year: 1994 Issue: No. 368 Pages: 441-452 Ref: 19 ref.

1994

บทคัดย่อ

Storage studies on sweet potato roots: experiences with KSP20 cultivar.

ABSTRACT

In Kenya, sweet potatoes are usually harvested sequentially as needed to circumvent bulk storage; only occasionally are rudimentary storage systems used. In laboratory experiments, sun-cured sweet potato cv. KSP20 tubers were stored in environmentally controlled cabinets at temperatures maintained at 5, 10, 15, 20 or 29 deg C, or in open-topped wooden boxes in dry soil, sawdust or exposed to the air (control). Tubers could be stored for 4-12 weeks without spoilage in environmentally controlled cabinets at temperatures of 15-20 deg ; at lower or higher temperatures the tubers sprouted, rotted, became pithy and/or excessively shrivelled. The quality of tubers stored in soil or sawdust was as good after 12 weeks as for those stored at 15 deg , and they had a superior appearance, even though there was a high rate of sprouting which reduced the DM content. Moisture loss was highest in the control. Vitamin C and beta -carotene content (% DW) in tubers decreased with storage duration, while content of

reducing sugars increased in the first 2-3 weeks of storage and then slowly declined. There was no significant difference in texture between boiled tubers stored under all the conditions.