Assertion: fertilizer's magnesium | /r/HasProperty | needed
Facets:
Source sentences:
text: In summary, make sure you obtain a soil test, determine if lime is needed for your crop situation, determine if magnesium is needed, and then use the ENP and magnesium content to select the most cost-effective lime material.
text: When soils are acidic (pH lower than 5.5), additional magnesium may be needed.