salinity and plant growth

Mary A Bisson bisson at
Wed Feb 12 11:29:45 EST 1997

Two notes on this thread.  One thing to remember is that MgSO4 has a very
low osmotic coefficient, so that 100 mM MgSO4 has a lower osmotic pressure
than 100 mM NaCl.  This may end up making it look as though the osmotic
stress is less severe with MgSO4.  The other thing is that ammonium will
not only alter the pH as well, but it is also likely to be toxic at
concentrations sufficient to deliver a significant osmotic stress.

Prof. Mary A. Bisson
Department of Biological Sciences
State University of New York
Buffalo NY 14260-1300 USA
phone: 716-645-2550
fax:   716-645-2975
e-mail:  bisson at

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