Table 3.
Balance of nitrogen and phosphorus in the experiment, kg per 1 ha of crop rotation per year.
| Crop rotation | Land content | Return with non‐ commoditypart | Balance |  % |
|
|---|---|---|---|---|---|
| R | F | ||||
| I a | 64.8 | 10.1 | ‐48.9 | ‐54.7 | ‐11.9 |
| I b | 76.5 | 12.8 | ‐69.0 | ‐63.7 | 7.7 |
| II a | 62.6 | 11.0 | ‐47.5 | ‐51.6 | ‐8.6 |
| II b | 75.6 | 13.6 | ‐66.5 | ‐62.0 | 6.8 |
| III a | 53.4 | 11.2 | ‐40.0 | ‐42.2 | ‐5.5 |
| III b | 60.6 | 12.0 | ‐50.1 | ‐48.6 | 3.0 |
Note: a represents 6 tons of manure, b represents 12 tons of manure + N37P37K37 per 1 ha of crop rotation, R represents estimated balance, F represents actual balance by the removal of N and P2O5. Designations of crop rotations are the same as in Table 2.
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