Ohio State University
Makerere University (Uganda); Virginia Tech (US)
J. Mark Erbaugh
D.S.O. Osiru, M.T. Asio, E. Adipala, S. Kyamaywa (Uganda); H. Warren (US)
A multi-locational approach was used to evaluate six (6) improved varieties: MU-93, TVX 337-025(B), IT90- 109 (B), KVU-12349, IT82D-516-2, IT85F-2841 against two local varieties Ebelat and Icirikukwai, during the two rainy seasons of 2002 in Kabanyolo, Pallisa, Kumi and Kaberemaido. Results indicate that the selected genotypes performed differently at different environments demonstrating the effect of genetic by environment (G X E) interaction. Five out of six improved genotypes out yielded local checks with an average of 1000 kg/ha, which is well above the national average of 300-500 kg/ha. The G X E analysis through the biplot revealed MU-93 as the best and stable genotype that gives high yields at all the environments. IT85F-2841 was found to be high yielding but very unstable, while KVU-12349 was low yielding but stable.
1. Compare yield performance of the local and introduced cowpea lines in different locations of Uganda. 2. Assess the relationships of different agronomic traits with yield performance of the cowpea lines.