Assertion: swiss chard's spinach | /r/HasAspect | higher requirement
Facets:
value: for magnesium
type: OTHER
value: for iron
type: OTHER
Source sentences:
text: Hydroponic spinach nutrition is similar to that of fancy lettuce, though spinach has a higher requirement for iron and magnesium, as these elements are found at greater levels in spinach leaves than in most other salad green types.