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[APD] Re: more water and electrolytes
In an earlier post I neglected to mention the role of sodium. Sodium is not
an essential nutrient, but like chloride tends to appear in plant analyses at
significant levels anyway.
Potassium is used by plants to activate some enzymes and to regulate osmotic
pressure. When potassium is in short supply some plants -- perhaps all --
can use sodium to regulate osmotic pressure in the place of potassium. That
role probably accounts for the relatively high concentrations of sodium that
sometimes appear in plant analyses.
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