Assertion: powder's use | /r/CapableOf | turn unproductive soil
Facets:
value: into carbon rich soil
type: TRANSITIVE-OBJECT
Source sentences:
text: Although American gardeners have been using charcoal for a short while, research on Terra preta soils in the Amazon has found the widespread use of biochar by pre-Columbian natives to turn unproductive soil into carbon rich soil.