Table 3.
Simulated dry matter production and nitrate leaching under pasture (with a urine patch, equivalent to 1000 kg N ha−1) and winter wheat scenarios. Values are given for (i) a base scenario that used a representative generic Horotiu soil description with a spin-up phase, (ii) removal of the spin-up phase, (iii) replacement if the soil description with S-map, and (iv) variations in OC, FBiom, and FInert, where OC was increased and decreased by 20%, FBiom was doubled and halved, and FInert was increased and decreased by 20% to a depth of 20 cm, by 10% from 20 to 60 cm, and by 1% below 60 cm.
| Scenario | Pasture (with urine patch) |
Winter wheat |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Values |
Diff. from base |
Values |
Diff. from base |
||||||
| Dry matter (t ha−1) | Nitrate leaching (kg ha−1) | Dry matter (t ha−1) | Nitrate leaching (kg ha−1) | Dry matter (t ha−1) | Nitrate leaching (kg ha−1) | Dry matter (t ha−1) | Nitrate leaching (kg ha−1) | ||
| Base | 13.9 | 534.4 | – | – | 16.1 | 36.3 | – | – | |
| No spin up | 14.8 | 526.4 | 0.9 | –8.0 | 14.5 | 27.5 | –1.6 | –8.8 | |
| S–map | 13.6 | 92.8 | –0.3 | –441.6 | 14.6 | 20.0 | –1.4 | –16.3 | |
| OC | 20% more | 14.0 | 530.3 | 0.1 | –4.1 | 16.6 | 43.4 | 0.6 | 7.1 |
| 20% less | 13.7 | 539.2 | –0.2 | 4.8 | 15.3 | 30.3 | –0.7 | –6.0 | |
| Fbiom | Double | 14.3 | 536.6 | 0.4 | 2.2 | 17.3 | 62.3 | 1.2 | 26.0 |
| Half | 13.5 | 533.7 | –0.3 | –0.7 | 14.5 | 25.6 | –1.5 | –10.7 | |
| Finert | More | 13.5 | 532.8 | –0.4 | –1.6 | 14.3 | 24.5 | –1.7 | –11.8 |
| Less | 14.1 | 536.4 | 0.3 | 2.0 | 17.2 | 51.4 | 1.1 | 15.1 | |