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).
