The Relationship between Yield Parameters and Morphological Characters for Barley: Evaluating linear and Non-linear models

The best statistical model (linear or non-linear) for use in the study of the relationship between yield parameters and morphological characters of barley was investigated. It was confirmed that Non-linear model (Exponential regression analysis) is better than linear for studying the relationship between yield parameters and morphological characters, because the determination coefficient for non-linear model was higher than the determination coefficient for linear model. Moreover, the residual distributions for non-linear equation were much better than the residual distributions for linear equation. A relationship between leafiness and yield parameters was not shown by both linear and non-linear models, while analysis of variance (ANOVA) indicated a positive significant difference in yield according to levels of leafiness. Consequently, yield parameters had been affected by morphological characters. The non-linear model for the study of the relationship is suitable for forecasting yield.