Screening for shade tolerance of sweet potato in an intercrop with corn in 1991.
1991
Chujoy E. | Ona P.I. | Gerpacio M.T.L.
Results indicated that harvesting sweet potato at 120 days increased the percentage of clones producing roots from 78.6% at 90 days to 98.6 % at 120 days; similarly mean root yield increased by 258%; mean number of roots by 21%; root size by 280% and dry matter slightly increased by 7%. The high increase in root yield and root size appeared related to the reduction in shade 78 days onwards as maize plants senesced. Eleven clones B008, Kinabakab, L002, BPI-SP2, B002, NCSU 1135, L072, PNG-18, PNG-3, PNG-135, and PNG-9 consistently had the highest yields at 90 and 120 DAP. A comparison with full sunlight grown sweet potato was made to determine the effect of shade on sweet potato plants in the intercrop with corn. At 90 DAP, root yield was reduced by 36% in the shaded sweet potato; similarly root number per plant decreased by 31% and root size by 32%. At 120 DAP the root yield reduction in the shaded sweet potato was only 6%. Root number per plant decreased by 41% however, root size increased by 54%. The slight reduction in root yield and increase in root size were associated with the ability of rapid recovery of sweet potato when shade was reduced 78 DAP onwards.
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