A Procedure for Stability Analysis with Multivariate Data in Vegetable Crops

For overcoming the problem of dissimilar pattern of G × E interactions for different traits in a multi-trait selection programme, a simple procedure (based on principle component approach) is suggested for reducing the multivariate data set to one of univariate, which can then be subjected to usual stability analysis. The suggested procedure is used to analyse the bivarlate data on six varieties of onion and seven varieties of tomato for yield and total soluble solids, generated under All-India Coordinated Vegetable Improvement Project during 1980–82 at Five locations. In onion, the two best adapted varieties are Pusa Red and Line 102, both developed at the Indian Agricultural Research Iastitute, New Delhi, while Udaipur 103 is the most stable cultivar. Among the tomato varieties, the two best adapted varieties are La Bonita and Roma, the latter being the most stable variety.