Fig. 1From: Improvement of growth performance of Amorpha fruticosa under contrasting regime of water and fertilizer in coal-contaminated spoils using response surface methodologyResponse 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)Back to article page