Figure S1. (a–c) Means ± SE of (a) residual NH4+-N (b) residual NO3-N and (c) residual NO3:NH4+ ratio in soils of the six harvests of the 2-year container study NO3:NH4+ (Experiment 1).

Figure S2. Means ± SE of levels of (a) residual NH4+, (b) residual NO3, (c) ratio of residual NH4+ : NO3 in target grassland plants exposed to only water (control) and water + benomyl (Benomyl) treatments (Experiment 2).

Figure S3. Means ± SE of total dry weight, total tissue N content and total tissue P content of plants in Experiment 2.

Figure S4. Means ± SE of shoot dry weight in Experiment 3.

Table S1. Means ± SE (= 4) of soil C, Total N, Olsen P and C:N ratios from the containerised plant monocultures at the harvest in December 2007 (Experiment 1).

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