Table 1 Nitrogen efficiency of digestate and inorganic fertilizer
Fertilizer type | Ammonia losses after spreading (% of total N) | Ammonia content before spreading (% of N t ) | Effective ammonia content (% of N t ) after deducting ammonia losses | Overall efficiency (after deducing ammonia losses) | Equivalent to mineral N fertilizer (%) |
|---|---|---|---|---|---|
Separated digestate (liquid phase) | 7 | 71 | 64 | 76 | 88 |
Separated solid digestate (average of catch crops and clover grass) | 7 | 22 | 15 | 63 | 73 |
Inorganic nitrogen (mineral fertilizer) | 0 | - | - | 86 | 1 |