Assertion: fertilizer's material | /r/ObjectUse | used for this purpose
Facets:
value: experimentally
type: MANNER
Source sentences:
text: Among the materials used experimentally for this purpose are feldspar, of which there are small deposits scattered widely over the United States; leucite, occurring as one constituent of a rock of which immense quantities are found in Wyoming; sericite, in extensive beds in Georgia, and green sand, of which large deposits are found in New Jersey.