Fig. 2 Relationship between transpirational water-use efficiency and carbon-isotope discrimination based on shoot dry matter (WUES) and total biomass (WUESR) as affected by low (-) and high (+) supply of phosphate and water. Discrimination (
) is calculated according to Eq [2]. If present, 13C of green leaf material was used for calculating . Linear regression is pooled for both varieties and R2-values are calculated for +P-treatments (solid line) and all treatments excluding treatment -P-W (broken line)
