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Fig. 4. Biplot of the AMMI2 for four testers (T1, T2, T3, and T4) and the 43 lines across 4 acid soil environments. Lines 3-1 to 3-16 (underlined) are from population SA3, lines 4-17 to 4-19 and 4-22 to 4-35 are from population SA4, and lines 5-36 to 5-43 (bold) are from population SA5. The first digit of the line designation has been removed in the figure to avoid cluttering. The first and second multiplicative components are represented by PC1 and PC2, respectively.
