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Fractional allocation of biomass to the below ground over two rotations for the four willow varieties: Endurance, Resolution, Terra Nova and Tora, grown at Harpenden (Harp) and Aberystwyth (Aber). Data are means ± SE of four replicates. Significant differences between the sites are indicated by ***=<0.001, **=<0.01 and *=<0.05. Rotation 1 = 2010–2012, rotation 2 = 2012–2014.
