Assertion: phosphorus | /r/CapableOf | take about 1 ton of phosphate
Facets:
value: to produce 130 tons of grain
type: PURPOSE
Source sentences:
text: It takes about 1 ton of phosphate to produce 130 tons of grain, although this figure is highly variable depending on soil conditions, farm history, crop type, and fertilizing efficiency (Vaccari, 2009).