Locational yield evaluation of five sweet potato [Ipomoea batatas (L.) Lam.] cultivars in the humid tropics of southeastern Nigeria
Five sweet potato cultivars ('Ex-Igbariam local', 'TIS 86/0356', 'TIS 8441', 'TIS 87/0087', and 'TIS 2532.OP.1.13') were evaluated for yield and agronomic performance in two different locations (Owerri and Umudike) during two planting seasons. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The planting density was 3333 plants ha‑1, and NPK fertilizer was applied at the rate of 100 kg ha‑1. The soils in the two locations are both acidic, low in organic matter and sandy loam in texture, with 0.47 and 0.52% N for Owerri and Umudike, respectively. Significant differences (p=0.05) were obtained in the performance of the cultivars in both locations in fresh tuber yields, biomass dry-matter yield, leaf area per plant and plant vigor at 6 weeks after planting. There was also significant (p=0.05) location × cultivar interactions with respect to tuber yields, biomass dry-matter yield and leaf area per plant. The highest fresh tuber and biomass dry-matter yield of 13.17 and 5.76 t ha‑1, respectively, was obtained in 'Ex-Igbariam local' at Umudike; but its performance at Owerri was relatively poor, with mean fresh tuber and biomass dry-matter yields of 2.19 and 2.76 t ha‑1, respectively. Irrespective of location, 'TIS 86/0356' gave the significantly (p=0.05) highest mean fresh tuber yield, of 9.00 t ha‑1, and a significantly (p=0.05) higher mean biomass dry weight of 3.53 t ha‑1, whereas 'TIS 8441' gave the lowest mean fresh tuber and biomass dry-matter yields, of 3.63 and 2.36 t ha‑1, respectively. 'TIS 86/0356', which gave the best performance in terms of tuber and dry matter biomass yields in both locations, was recommended. However, for sweet potato growers at Umudike, 'Ex-Igbariam local' appears well adapted to this region and may be preferred.
Okorie, H.A., Ohazurike, N.C. and Njoku, T.C. (2016). Locational yield evaluation of five sweet potato [Ipomoea batatas (L.) Lam.] cultivars in the humid tropics of southeastern Nigeria. Acta Hortic. 1127, 445-450
sweet potato, cultivars, yield evaluation