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· Plant Whisperer
2,547 Posts
It depends on the nutrient in question.

Basically I think this is what you want to know:

  • PO4 is taken up in the day and night, but much more is absorbed in the light. PO4 is also preferentially taken up by shoots and roots.

  • Ca and K are both absorbed in light and darkness but more during the dark.

  • Mg is absorbed almost equally in light and darkness.

Phosphate and nitrate uptake thread:

Phosphate uptake in aquatic plants paper: macrophyte Myriophyllum spicatum L..pdf
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