2021, VOLUME 8 ISSUE 1Pages: 42-49
Seedbed types and effects on growth and yields of orange fleshed Sweet Potato varieties in a humid high rainfall area of Nigeria
Lesi Dike Gbaraneh and Victoria Wilson*
*Department of Plant Science and Biotechnology, Rivers State University, Port Harcourt, Nigeria
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The experiment was conducted to determine the effect of seedbed type on vegetative growth and tuber yields of two varieties of orange fleshed sweet potato (Ipomoea batatas). Treatments were 3 seedbed types - ridges, flat and mounds with 2 orange fleshed sweet potato varieties in a factorial arrangement in a Randomized Complete Block Design with 3 replications. This field experiment was conducted between May and November 2019 at the Teaching and Research Farm of the Rivers State Institute for Agricultural Research and Training, Rivers State University, Port Harcourt, Nigeria. The field was ploughed, harrowed and ridges and mounds prepared manually. Nodal vines of 2 varieties of orange fleshed sweet potato, UMUSPO 1 “King J” and UMUSPO 3 “Mothers Delight” were planted on the ridges, mounds and on the flat (ploughed and harrowed only). At harvest length of vine, number of secondary vine branches, and number of leaves, fresh weight of vines and fresh weight of leaves, number and weight of storage roots were recorded. The storage roots were graded into 2 categories according to sizes as marketable tubers (≥150 g) and seed tubers for propagation (<150 g). Seedbed type did not significantly ((P≥0.05) affect all the vegetative growth and tuber yield parameters measured. There was no significant difference in the vegetative growth and tuber yields of the orange fleshed sweet potato varieties. There were no significant interaction effects between seedbed type and orange fleshed sweet potato varieties. A correlation matrix showed 16 significant positive correlations out of the possible 55 matches of vegetative and yield traits examined. To reduce cost of labour, stress and time, farmers could plant orange fleshed sweet potato varieties on the flat without significant loss in foliage and tuber yields in a high rainfall area after ploughing and harrowing.