Genotype X environment interactions and grain yield stability of haricot bean varieties in Northwest Ethiopia. W.Tadesse and Others. Published by Scientific Research and Essays
Haricot bean is one of the most important and widely cultivated species of bean in Ethiopia. It plays a key role in human nutrition and the market economies of many areas, and is widely grown by smallholder farmers in the country’s central rift valley.
Limited efforts have been made to promote improved bean technologies, and productivity remains low due to the fact that high yielding varieties adapted to diverse ecological conditions are not being widely used by smallholders.
Several improved varieties that could potentially meet local consumption and export needs exist, but the performance of these varieties has not been evaluated under conditions prevalent in northwest Ethiopia.
The lack of information about the response of crop varieties to variable environmental conditions limits accurate yield estimates and fails to identify suitability for a given region or climate.
The objective of this study was to evaluate how grain yields from several varieties of haricot beans responded to multi-environment trials across divergent ecological locations.
The study was conducted over two successive years at three locations in Ethiopia - Fenote Selam, Zema and Addis Zemen - which represent different haricot bean growing ecologies.
Statistical models were used at each location to evaluate seven haricot bean varieties - Melkie, Mexican-142, Atendaba, Awash-1, Besh Besh, Brown Speckled and Roba-1 - which had previously been released in central and southern parts of Ethiopia.
Results of all models in this study identified Atendaba and Roba-1 as the two best performing and most stable varieties. Researchers therefore recommend these varieties for further production in the region.