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Discussion Starter · #1 ·
Simple question: assuming none of your nutrient levels ever reach zero, is there any change (increase) in uptake by having a higher concentration?

example:

NO3 uptake is, say, .1 ppm/day. Will that change if average water column level is 20 ppm vs 10 ppm? I infer not, but asking anyway.
 

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I don't know if the uptake changes, but I remember Tom Barr saying that the enzymes that the plant uses to uptake the nutrients have different forms depending on nutrient concentration. These forms have different affinities for the nutrients and, thus, in lower concentrations, they can still take what is in the water. If you want to dive deeper, there is this book chapter with more information.
 
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