| for many biological processes | 7 | transitive-object |
| in the manufacture of fertilizer | 4 | purpose |
| in the prevention of kidney stones | 2 | purpose |
| ammonia → be → important | 9 |
| ammonia → be → essential | 9 |
| ammonia → be → key component | 4 |
| negative | neutral | positive |
| 0.160 | 0.625 | 0.216 |
| Raw frequency | 22 |
| Normalized frequency | 0.447 |
| Modifier score | 0.500 |
| Perplexity | 39.649 |