养分 is the umbrella word for 'nutrients' - both biological (in soil, food, blood) and metaphorical (intellectual or emotional nourishment). The
分 here is read fèn (fourth tone, 'portion/share'), not the more common fēn ('to divide'). Don't confuse with
营养 (yíngyǎng, 'nutrition'):
养分 is the substance,
营养 is the value/process.
