Abstract
Among the crops grown in the tropics, sweet potato ranks second after cassava. Field research was conducted at the National Root Crops Research Institute, Umudike, south-eastern Nigeria, to evaluate the response of orange-fleshed sweet potato varieties to intra-row spacing. Treatments included four varieties (Umuspo 1, Umuspo 3, Ex-Igbariam and Ex-Oyunga) and three intra – row spacings (20, 30 and 40 cm). Weed density and growth decreased, but sweetpotato leaf area index (LAI), fresh shoot biomass and storage root yield increased significantly (P<0.05) at the closer spacing (20 cm) than at the wider spacings (30 and 40 cm). Umuspo 1 had higher LAI and shoot biomass; and suppressed weeds more than other varieties. Also, storage root yield of Umuspo 1 (27.2t/ha) was significantly higher than that of Umuspo 3, Ex-Igbariam and Ex-Oyunga by 35, 103 and 325%, respectively.Keywords: Plant spacing, variety, yield, orange-fleshed, sweet potato, Nigeria
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