Growth and yield analysis of three sweet potato cultivars under varying photoperiods
1991
Gerpacio, M.T.L. | Opena, G.B. | Vander Zaag, P. (International Potato Center, Southeast Asia and the Pacific Regional Center, P.O. Box 933, Manila (Philippines))
Sweet potato was evaluated through growth analysis under 12-, 18-, and 24-hour photoperiods. No significant differences on canopy cover were observed among plants grown under the different photoperiods. Vine was generally longer at higher photoperiods although the difference among photoperiods for vine length was not significant. Branch number was not significantly affected by the photoperiod. Profuse flowering was observed in sweet potato plants exposed to 12 hours photoperiod. The effect of short photoperiod was highly evident on NCSU 925 and Bureau which produced the highest number of flower throughout the growing season. No significant differences were also observed on dry matter production. However, harvest index (tuber dry matter/total dry matter) was significantly grown under longer photoperiods indicating that longer photoperiods favored dry matter accumulation in the vegetative parts than in the storage roots. Final storage root (SR) yield, average SR yield and SR number per plant were not significantly affected by the different photoperiods. Results indicate the extreme adaptability of sweet potato to a wide range of photoperiods without significantly reducing yield.
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