Figure 2.

Phenological, morphological, physiological, and root traits underlying the components of Passioura's yield-water framework. Figures on gray background indicate secondary inter-trait associations. (Closed triangles: 2011; open diamonds: 2012; regression lines indicate significant relations). Units are: Ground cover rate % Cd⁻¹, Root length density cm cm⁻³, Time to flowering °Cd, Water use_ET mm, Stomata conductance mmol m⁻² s⁻¹, Biomass g m⁻², SPAD dimensionless, Harvest index g g⁻¹, Plant height cm, Root:Shoot ratio g g⁻¹.