Assertion: fertilizer's element | /r/HasProperty | calcium
Facets:
Source sentences:
text: Secondary elements: calcium, magnesium, and sulphur.
text: The 16 elements required by all plants are carbon (C), hydrogen (H), oxygen (O), phosphorus (P), potassium (K), nitrogen (N), sulfur (S), calcium (Ca), magnesium (Mg), iron (Fe), boron (B), manganese (Mn), copper (Cu), zinc (Zn), molybdenum (Mo), and chlorine (Cl).