Figure 4
From: Forbs enhance productivity of unfertilised grass-clover leys and support low-carbon bioenergy
Standing root biomass in the four seed mixtures in August 2015. (a) at three soil depths without fertilisation; (b) at three soil depths with fertilisation; (c) for different root compartments at 0–10 cm depth without fertilisation; and (d) for different root compartments at 0–10 cm depth with fertilisation. Data are means ± SE (n = 3) for each soil depth or root compartment. Means for seed mixtures with different lowercase letters are significantly different (P < 0.05) using Tukey’s post hoc test.
