Time interval (years) | Soil organic matter (%) | Grain yield (kg∙ha−1) | Increase of grain yield due to the application of 200 kg FDA ha−1 (kg∙ha−1) | |
without FDA† | with 200 kg∙ha−1 from FDA | |||
1 - 5 | 4.80 | 3450 | 4674 | 1224 |
6 - 10 | 4.65 | 3348 | 4594 | 1246 |
11 - 15 | 4.21 | 3034 | 4349 | 1315 |
16 - 20 | 3.39 | 2377 | 3834 | 1457 |
21 - 25 | 3.67 | 2613 | 4019 | 1406 |
26 - 30 | 3.70 | 2638 | 4038 | 1400 |