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Table 1 Nitrogen efficiency of digestate and inorganic fertilizer

From: The use of legumes as a biogas substrate - potentials for saving energy and reducing greenhouse gas emissions through symbiotic nitrogen fixation

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