Abstract
Interrelationships between tuber dimensions and yield during development of six sweet potato cultivars with different tuber shapes were examined. Maximum tuber lengths and tuber stalk lengths were attained after 16 and 8 weeks of growth, respectively. Rates of increase in tuber width in the 16- to 24-week period and final tuber widths were related to the mean tuber weight and yield of the cultivars studied, e.g. rates were highest in the high yielding cv. O49 and low in cv. A16/15. Relationships between parameters of tuber development, tuber dimensions, sink strength and yield were evaluated and tuber width appeared to be the most important single dimensional determinant of high yield. However, tuber shape in cv. 03/62 was different from other cultivars and this cultivar was an exception in the interrelationships described. Some factors known to affect tuber shape and development were discussed.
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