Yield Stability Analysis of 'Ipomoea batatus' L. Cultivars in Diverse Environments
2009; Southern Cross Publishing; Volume: 3; Issue: 4 Linguagem: Inglês
ISSN
1835-2693
AutoresMO Osiru, OM Olanya, E. Adipala, R. Kapinga, B. Lemaga,
Tópico(s)Agricultural Practices and Plant Genetics
ResumoSweet potato is an important food crop in tropical and sub-tropical regions of the world. There is limited published research on yield stability of sweet potato in tropical environments. To identify cultivars with improved agronomic and stable yield characteristics, five elite genotypes obtained from the sweet potato breeding program in Uganda and International Potato Center (CIP) and five land race genotypes were evaluated for yield stability at 12 environments. The Additive Main Effects and Multiplicative Interaction (AMMI) model was used for stability analysis. The analysis of variance of yield data (t ha{-1}) for genotypes x locations, genotypes x seasons and locations x seasons was highly significant (P < 0.01) showing the variable response of the genotypes across environments and seasons. The average root yield of sweet potato genotypes was significantly (P < 0.01) greater at Kachwekano (KARDC) than at Namulonge (NAARI) and Serere (SAARI) locations. Based on AMMI statistical model, Araka Red and Tanzania were the most stable genotypes; while NASPOT 6 and NASPOT 2 had the lowest stability. The model predicted the highest yield from Dimbuca cultivar in 4 of 12 environments and New Kawogo as the cultivar with the lowest yield in 6 of 12 environments. Within each environment and cropping season, the ranking of the genotypes for yield stability was not consistent. Selective deployment of cultivars across environments can improve Sweet potato tuber yield in the lowland and highland tropics.
Referência(s)