stress interactions

[Sandra Johnson]

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 ceeb.uky.edu.

Thanks.
Sandra

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