Relative biochar induced changes on above ground biomass (left), total biomass production (middle) and plant C/N ratio (right) in dependence of the unamended control. We

performed separate non-parametric ANCOVA’s using Euclidian distance measures with time as a covariate to assess how biochar amendment affects plant functional

parameters. We took 8 replicates at three harvests each (21, 28 and 35 days of plant growth). Small letters indicate significant differences (p<0.05) between groups (small letter

“a” indicates differences between treatment and the unamended control). The η2 values indicate the relative effect sizes of each explaining factor on plant parameter variation.

Data is shown as means and their standard error.