stress interactions

Sandra Johnson sjohnson at
Mon Nov 25 13:54:22 EST 1996

I've been thinking about a problem concerning the mobility of 
nutrients through soil. Nitrogen, for example, is thought to be a 
mobile nutrient which moves to plant roots by mass flow, whereas 
Phosphorous adsorbs to soil particles and moves to plants via 
diffusion. Under water stressed conditions where the availability of
N vs P has not changed, I would expect N to become more limiting 
than P through decreased availability. 

Does this seem reasonable?
How could I test this prediction?

Any thoughts on this question will be appreciated.
Please send responses to sjohnson at


Sandra Johnson. Ph.D.
University of Kentucky
101 Morgan Building
Lexington, KY  40506

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