Assertion: potassium nitrate | /r/AtLocation | soil
Facets:
value: by the natural decaying process
type: CAUSE
value: by the use of fertilizers
type: CAUSE
Source sentences:
text: Because potassium nitrate can be found in soils, either by the natural decaying process or by the use of fertilizers, it gets absorbed into vegetables such as spinach, celery and cabbage 12.