Fig. 1
Response surface plots showing the effect of soil-water (W), nitrogen (N) and phosphorus (P) on the plant height (a), stem diameter (b), root length (c), dry biomass (d-e), and root-shoot (R/S) biomass ratio (f)
Response surface plots showing the effect of soil-water (W), nitrogen (N) and phosphorus (P) on the plant height (a), stem diameter (b), root length (c), dry biomass (d-e), and root-shoot (R/S) biomass ratio (f)