, the pH of the medium scale
continuous experiment was only tested twice during the
experimental period. The pH did not vary between treatments,
but varied with time (8.17 ± 0.04 on day 36 and 7.81 ± 0.13 on
day 49; average ± SD; for each n = 9). Organic carbon and total
nitrogen did not differ between treatments of the continuous
experiment, and together with the C/N ratios, these parameters
exhibited a greater variability in the continuous experiment than
in the batch experiment (Fig. 4).