Multi-location rice evaluation trials were conducted during the 2013 cropping season at four locations which were key rice production areas within the Guinea and Sudan savannah agro-ecological zones of northern Ghana. Two growing ecologies: one irrigated and one rain-fed were involved in each agro-ecological zone. The purpose of the trials was to evaluate some thirty germplasm materials for grain yield stability and adaptability within the northern savannas. Entries were planted in a randomized complete block design replicated three times in each location. Adaptability studies using Additive Main effect and Multiplicative Interaction (AMMI) analysis for grain yield indicated that the genotype (G), environment (E) and their interaction (GEI) effects were significantly different (p<0.01), indicating broad range of diversity existed among the genotypes. Five genotypes, including Anyofula, Basmati 123, GH1837, Good and New and Perfume (ST) showed superior grain yield performance over the checked material, GR 18, and appeared to be specifically adapted to the higher yielding irrigated sites. On the other hand, genotypes that were identified as broadly adapted to all the four locations included Sebota 87, Matigey, Basmati 113, Sebota 68, IR 72 (pH) and Sebota 36. The adapted materials, especially those which outperformed the checked material, had the potential to increase rice productivity within the northern savannas and were therefore recommended for further breeding work and subsequent release to rice farmers.Keywords:
Germplasm materials, grain yield stability, adaptability, lowland and genotype.