Evaluation of the American Yam Bean (Pachyrhizus spp.) for Storage Root Yield Across Varying Eco-geographic Conditions in Uganda
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Agricultural Science
Abstract
The American yam bean (Pachyrhizus spp.) is a legume crop that is exclusively used for its storage roots. The
seeds are inedible due to presence of toxic rotenone. It produces high storage root yields comparable of major
root crops like cassava or sweetpotato. And flower pruning more than doubles its root yield performance. Using
twenty five yam bean accessions, the current study aimed to determine root yield stability and adaptability, and
presence of yam bean production mega environments in Uganda. Trials were planted at three stations,
Namulonge, Serere, and Kachwekano during two consecutive seasons of 2011. Fresh storage root yields were
significantly different (p < 0.05) across locations with the ideal location being Namulonge (fresh storage root
yield of 10.1 t ha-1), followed by Serere (8.0 t ha-1), and Kachwekano (3.1 t ha-1). Results of AMMI analysis
indicated the presence of genotype-by-environment interaction for fresh storage root yield. Through AMMI
estimates and GGE visual assessment, genotype 209017 was the highest yielding with mean yield of 20.7 t ha-1.
Genotype 209018 with mean yield of 15.5 t ha-1 was the most stable and adapted accession in the entire
discriminating environment in Uganda. From the environmental focusing plot, the six environments were
grouped into two putative mega environments for yam bean production.
Description
Keywords
American yam bean (pachyrhizus spp.), Accessions, Ammi model, Yield stability
Citation
Andiku, C., Tukamuhabwa, P., Ssebuliba, J. M., Talwana, H., Tumwegamire, S., & Gruneberg, W. J. (2019). Evaluation of the American yam bean (Pachyrhizus spp.) for storage root yield across varying eco-geographic conditions in Uganda. Journal of Agricultural Science. https://doi.org/10.5539/jas.v11n8p100