Assertion: fertilizer's phosphorous | /r/HasProperty | vital
Facets:
value: for the growth of roots
type: PURPOSE
Source sentences:
text: Phosphorous is vital for the growth of roots, potassium helps with flowering and general growth, and nitrogen helps with foliage.
text: Nitrogen, phosphorous and potassium are essential plant nutrients, and fertilizers are graded by the amounts of these elements the fertilizers contain, also called their "NPK rating" (from those elements' abbreviations on the periodic table).