The sweetpotato [ Ipomoea batatas (L.) Lam] cultivars Jewel, Shore Gold, and Cordner, and the breeding line W241 were either 1) not flooded, 2) flooded for 5 days during midseason, or 3) flooded for 5 days just before harvest. Flooding just before harvest did not affect marketable yield, but flooding at midseason reduced marketable yield by 36% in 1989 and by 53% in 1990 and reduced the No. 1 grade yield by 46% in 1989 and by 57% in 1990. Marketable yield of `Jewel' was higher than that of `Cordner' in 1989, and that of `Shore Gold' exceeded that of `Jewel' in 1990. There were no interactions between flooding treatments and cultivars.
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Roberts et al. (1991) studied this question.