Yield stability of promiscuous soybean genotypes in Uganda

A field experiment was conducted in five major soybean growing areas in Uganda with 12 promiscuous soybean genotypes. Seeds of genotypes were inoculated with fresh culture of Bradyrhizobium sp. strain USDA 3456 and grown in the fields for two rainy seasons. Experiments were conducted in randomized complete block design with three replicates. Grains were harvested at maturity, weighed to estimate yields in kg ha-1. Data were subjected to ANOVA, AMMI, and GGE analysis. Genotype by environment interaction was significant (P<0.01). Kabanyolo I, Namsoy 4M, Wondersoya, Maksoy 5N, and Nam II were stable genotypes for grain yield. Nam II and Namsoy 4M had the highest yield and the environment Kasese season B had the highest performance (1726.6 kg ha-1). Nakabango B and Kasese B were the most discriminating environments. This study provides information that can guide cultivars recommendation in major soybean growing areas in Uganda.