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I've been curious for a while about nutrient levels and deficiencies and I had this thought:

Isn't it logical to assume that if any nutrient is measurable in the water column than by definition there is no deficiency?

I mean if there is even 2mg/l of NO3 in the water column that means the plants still have that much available to them before there is no more?

Or is it that plants have problems using nutrients if they are *below* certain concentrations in the water column? :? But on the other hand I know that if I don't dose NO3 it will get to zero.... same with Fe... So therefore plants can either assimilate the nutrients all the way down to 0 concentrations or they are precipitating out of solution.
 
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