Agriculture and forestry

Determination of the most appropriate genotypes based on the multiple trait index is a new method in plant breeding programs. Unpredictable climatic conditions are altering the selection of genotypes based on multiple environmental conditions and multiple traits. In barley breeding programs, some traits (quality, earliness, lodging, etc.) can serve many of our primary breeding purposes other than grain yield. For this reason, the genotype by yield*trait (GYT) biplot approach was used to definite the best barley candidate among 12 barley genotypes based on multi (three) location and multi (nine)traits. In this study, the strengths and weaknesses of each genotype were determined by combining yield and other target traits with GYT biplot method. The general adaptability of each genotype in terms of all features showed differences with concerning for the average of years. On the other hand adaptability of genotypes differed significantly in terms of GYT biplot and GT biplot methods. In the GT biplot method, both the properties and the genotypes showed a wide distribution, whereas in the GYT biplot method yield-feature combinations showed a narrower variation and the most stable genotypes were identified more clearly. Besides, it was concluded that GT biplot method GT bipot method is not very ideal for determining the best genotypes, whereas GYT biplot showed that G4 genotype, was the best; G3, G7, and G5 (Altıkat) variety were ideal genotypes for combined traits. GYT biplot has shown that superior, ideal and stable genotypes can be detected visually by combining all traits in breeding programs.