Fig. 3From: Effect of biodegradable poly-3-hydroxybutyrate amendment on the soil biochemical properties and fertility under varying sand loadsA Basal, B d-glucose, C N-acetyl-β-d-glucosamine, D d-trehalose, E l-alanine, F l-arginine and G l-lysine induced respiration in the growth substrates; the lowercase letters indicate significant differences at p ≤ 0.05Back to article page