Multi-locational studies of selected sweetpotato (Ipomoea batatas [l.] Lam.) genotypes for improved agronomic traits

Abstract

Sweetpotato has become increasingly important in the farming systems of Northern agro-ecologies of Ghana. The objective was to investigate the relative yield performance of elite sweetpotato genotypes at multi-location. Six (6) elite genotypes viz; PGA14008-9, PGA14011-43, PGA14351-4, PGA14372-3, PGA14398-4 and PGA14442-1 were evaluated together with 3 checks varieties (Apomuden, Bohye and Ligri) in trials at Bawku, Nyankpala, Tono and Wa for 2 cropping seasons. Vine cuttings of genotypes were planted on four-ridge plot of 20.4m² and arranged in randomized complete block design (RCBD) with three replications at each location. Variables recorded were root yield (Ryld), foliage yield (Foyld), root dry matter (DM) content and tolerance to weevil (Cylas sp.) infection (WED). Genotypes PGA143011-43 recorded the highest overall root yield of 21.11tha-¹, roots plant-¹ of 4 and foliage yield of 15.20 tha-¹. This was followed by PGA14008-9, with root yield of 18.42 tha-¹, root plant-¹ of 5 and foliage yield of 12.52 tha-¹. Genotype PGA14372-3 was the best performing genotype for root dry matter content and weevil damage effect to storage roots. PGA143011-43 and PGA14008-9 have shown superior and stable performance across test locations.

Keywords:

Sweetpotato, multi-environments, variability, northern agro-ecologies, agronomic traits, farming systems, genotype-by-environment, stable performance.