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Fig. 1. Diagrams of the first two principal component (PC) loadings and scores calculated for (A) each variate measured on timothy and (B) each treatment [four stages of development (S1: stem elongation, S2: early heading, S3: late heading, and S4: early flowering) and four N applications (0, 60, 120, and 180 kg N ha^–1 referred to as N1, N2, N3, and N4, respectively)]. Values are based on the average of 2 yr, 2001 and 2002.