Mycorrhizae. Thirty-six weeks after AMF inoculation, average
mycorrhization rates of Trifolium roots were 26% in 1AMF and
15% in 2AMF treatments. Across soil layers, herbicide application
significantly reduced mycorrhization in 1AMF (F1;10 5 7.887, P 5
0.023) but had no effect on mycorrhization rates in 2AMF
mesocosms (Figure 2). The reduction in mycorrhization due to
herbicide application was even more pronounced when soil layers
were considered separately (Table 1, Figure 2). In 2RU/2EW
mesocosms mycorrhization was significantly different between
layer 0–5 cm and layer 5–10 cm (F1;10 5 14.756, P 5 0.018). In
2RU 1 EW mesocosms mycorrhization differed significantly
between layer 0–5 cm and layer 10–30 cm (F1;10 5 23.093, P 5
0.009). In 1RU/2EW mesocosms mycorrhization differed significantly
between layer 0–5 cm and layer 10–30 cm (F1;10 5 20.050,
P50.011). Earthworms had no influence on root AMF colonisation