Statical analysis of correlation between yield and earliness, and other trait of upland cotton varieties (Gossypium hirsutum)

In this study, 11 cotton varieties (G. hirsutum) along with two checks treatments were studied using a randomized complete block design with four replications at Varamin cotton research department to evaluation of correlation between yield and earliness with other quantitative traits in 2008. Agro-morphological and fiber quality of the cultivars were recorded and correlation between yield and earliness with other traits were calculated based on them for each variety. Step wise regression of yield and earliness as independent variables and other traits as dependent variables were calculated separately to each cultivar. The results showed there is a high variation among cultivars regarding correlation between yield and earliness with other traits. The variation also existed among cultivars in term of those traits which entered the multiple regression models as dependent variables. These variations among cultivars are useful in the further breeding programs in view of breaking undesired correlations of the traits and improving them simultaneously in the current cultivars.