Effect of plant spacing and variety on weed and performance of orange-fleshed sweet potato in humid agro-ecological zone of Nigeria
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
Submission of a manuscript implies; that the work described has not been published before (except in the form of an abstract or as part of a published lecture, or thesis) that it is not under consideration for publication elsewhere; that if and when the manuscript is accepted for publication, the authors agree to automatic transfer of the copyright to the publisher.
Copyrights for the papers published in UJAS are retained by the authors, with first publication rights granted to the journal. The journal is not responsible for subsequent uses of the work. It is the responsibility of the author to bring an infringement action if so desired by the author.
The journal has an online Open Access policy licensed according to Creative Commons Share-Alike Non-Commercial.