Analysis of Adaptation in Triticale Cultivars

The adaptation and performance of 20 triticale (X Triticosecale Wittmack) cultivars grown in 15 environments in the Uniform Triticale Yield Nursery were studied. Cultivars responded differently in different environments. Location and cultivar × location mean squares were significantly different at the 1 % level of probability. Cultivars OK'77802 and OK'77803 had the highest mean grain yields in 15 environments, with regression coefficients of 1.205 and 0.990, respectively. Cultivar 6TB'225 had the highest regression coefficient (1.352) and was the highest'yielding cultivar at five locations. The highest grain yield was recorded at Fort Collins, CO, followed by Davis, CA. Simple correlation coefficients indicated the similarity in performance at Huntsville, AL; Wooster, OH; and Knoxville, TN. Additional testing of a number of triticale cultivars at these locations is suggested.