Fig. 4. The polygon view of the genotype by trait biplot for 1999, demonstrating soybean genotype comparison on the basis of a GT biplot. DTM = days to maturity, HEIGHT = Plant height, KW = 100 seed weight, LODG = lodging scores, OIL = percentage of oil, PROTEIN = percentage of protein, YLD = seed yield, YOIL = oil yield per unit land area, and YPROT = protein yield per unit land area.