ISSN: 0041-3216

ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 63 Number 4
Research Papers
Responses of four sweet potato cultivars to levels of shade: 2. Tuberization
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The tuberization responses of four sweet potato cultivars to shade during the first eight weeks of growth were compared. Tuber fresh weight was not affected in 25% shade, but in 55% shade values were noticeably lower, and in 73% shade tuberization was almost completely suppressed in all cultivars. The responses resulted from slower tuber growth in 55% shade and from delayed tuber initiation and slower tuber growth in 73% shade. The major cultivar differences observed were that two cultivars had fewer thick roots, lower potential and percentage tuberization indices and fewer and smaller tubers in 55 and 73% shade than the other two; the latter demonstrated greater capacity for tuber initiation and tuber growth even in 73% shade and thus appeared to be more shade-tolerant than the former in early growth.
Keywords: Sweet potato cultivars; Shade; Tuberization