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You can lead a blind man to water....

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I recommend you read the chapter in more detail. It describes mechanisms of ion influx/efflux across the plasma membrane from vacuole-cytoplasm and cytoplasm-external solution.

LeastExpectedGrower said "Waiting for someone to slap down the actual scientific process by which the plants are removing any additional nutrients they've absorbed. As far as I know, there's no biological process where plants excrete/secrete nutrients through their roots. It's a one way street...

I wasn't trying to contradict you. And I'm not making a point in support of or against 'flushing'. Just letting you know that plants do in fact have biological mechanisms for both influx and efflux nutrients. You asked for the science and I posted it. I thought you and others might be...

"For the kinetics of ion uptake by plants, the Michaelis- Menten equation has been modified to include the param- eter Cmin, and the term I, designating unidirectional influx, has replaced the term V (Fig. 2.11). Very often, though, only the net uptake of ions is determined experimen- tally...