Plants have mechanisms for nutrients uptake from soil water, varying with species. I'm looking for a general model or co-relation which will enable to predict concentration of essential nutrients that a plant takes up with respect to concentration of same in soil-water.

This relation can't be simple as there are many variables which will affect it. But such predictions can help in agriculture while choosing crop type, irrigation water, fertilisers, to enhance yield and reduce phytotoxicity.

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