| Country | Locality | Ref. |
|---|---|---|
| Belgium | Belgium, chem. comp. of sample fed with @Azolla@ only | 4883 |
| Belgium | Belgium, chem. comp. of sample fed with pellets & @Azolla@ | 5419 |
| Belgium | Belgium, chem. comp. of sample fed with pellets only | 5419 |
| Belgium | Belgium, initial chem. comp. of sample before treatment | 5419 |