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Competition Between Sweet Potato Cultivars in Small Plots


Field experimentation with sweet potatoes [Ipomoea batatas (L.) Lam.] is difficult because extraneous sources of error often require extensive replication and multiple experiments (1). These problems are compounded when cultivars of different growth habits are compared in adjacent plots. Because sweet potato plants produce extensive prostrate vines, there has been considerable controversy among researchers as to whether cultivars planted in adjacent rows compete with one another such that cultivar evaluation is compromised. This controversy was recently asserted by Bouwkamp (2), who used turning point tests and showed that the competitive effects of cultivars do not affect sweet potato yield trial results enough to justify the use of multi-row plots (2).