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Interpreting Treatment x Environment Interaction in Agronomy Trials

^a Universidad Autónoma de Chapingo, Km 38.5 Carretera México-Texcoco, Chapingo, Mexico and Biometrics and Statistics Unit, CIMMYT, Apdo. Postal 6-641, 06600 Mexico D.F., Mexico
^b Biometrics and Statistics Unit, CIMMYT, Apdo. Postal 6-641, 06600 Mexico D.F., Mexico
^c Wheat Progr., CIMMYT, Apdo. Postal 6-641, 06600 Mexico D.F., Mexico
^d Dep. of Plant Sci., Lab. of Plant Breeding, Wageningen Univ., P.O. Box 386, 6700 AJ Wageningen, the Netherlands

View larger version (27K): [in a new window]   Fig. 1. Biplot of the first and second additive main effect and multiplicative interaction (AMMI) axes representing 24 cultural practice treatments (1–24) evaluated over 10 yr (1988–1997) and enriched with the following selected environmental covariables: mT, minimum temperature sheltered; mTU, minimum temperature unsheltered; EV, total monthly evaporation; MT, maximum temperature; D, December; J, January; F, February; M, March; and A, April (from Vargas et al., 1999).

View larger version (31K): [in a new window]   Fig. 2. Biplot of the first and second partial least squares (PLS) factors representing the Z scores of the 10 yr (1988–1997) and the Y loadings of the 24 practice treatments (1–24) enriched with the Z loadings of 27 environmental variables: EV, total monthly evaporation; PR, total monthly precipitation; SH, sun hours per day; mT, mean minimum temperature sheltered; MT, mean maximum temperature sheltered; mTU, mean minimum temperature unsheltered; D, December; J, January; F, February; M, March; A, April; and N (from Vargas et al., 1999).