Fig. 2

Response surface plots showing the effect of soil-water (W), nitrogen (N) and phosphorus (P) on the leaf water potential (LWP) (a), photosynthesis rate (Pn) (b, c), transpiration rate (Tr) (d), stomatal conductance (Gs) (e), water use efficiency (WUE) (f), and total chlorophyll (total Chl) content (g-h)