Yield Gap Analysis of Common Bean through On-Farm Demonstrations in Central Rift Valley (CRV) of Ethiopia

Abstract

This study proposes to analyze the yield gap of common bean varieties through on-farm demonstrations in the central Rift Valley of Ethiopia. The districts were purposefully selected based on their common bean production potential. A total of sixteen (16) trial farmers were selected from potential haricot bean-growing kebeles. Two improved common bean varieties, SAB-632 and SAB-736, and one standard check (Nasir) were planted on a plot size of 0.125ha. The result shows the highest mean yield was 26 qt/ha for SAB-632 in Shalla, followed by (24.4 qt/ha) at Adami Tulu Jido Kombolcha district. The increase in productivity of SAB-632 at Adami Tulu Jido Kombolcha and Adama district over respective standard checks was 20.35 % and 51.5 % respectively. The mean extension gap was 5.7 qt/ha in SAB-632, while -1.07 qt/ha was in SAB-736 variety. In addition the mean technology index was 7.7 % in the SAB-736, while it was 32 % for SAB-736 varieties. Across all locations, SAB-632 varieties have a technology index of less than 15 % indicating that their performance by these varieties in those district conditions was more than satisfactory. There is a need to adopt and scale up SAB-632 on a larger scale to enhance the adoption of variety.