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).

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