Figure 2. Biplot generated using standardized Best Linear Unbiased Predictor values of root trait means from clones of the 386 F₁ white clover mapping population progeny grown in hydroponic and sand conditions. Components I and II account for 36 and 27% of total variation, respectively. The symbols indicate progeny Groups 1 to 6 generated from cluster analysis. The vectors represent the root traits: RDI, root diameter (mm); RL, root length (cm); RS, root surface area (cm²); RT, number of root tips; RV, root volume (cm³); TL, ratio RT/RL (no. cm^–1). The numbers 5 and 6 included as a suffix in the root trait codes, refer to the hydroponic experiment in year 2005 and sand experiment in year 2006, respectively. The arrows () indicate the labels of directional vectors that are closely aligned and those that are not legible.