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1. The point brought up by Mark does have merit; different ions
have different "mobilities" in an electric field, hence different
conductivities. So what exactly does measuring EC tell you about the
effect of a given solution on orchids?
2. Technically, salts by definition include all substances, other
than acids and bases, in which the charges of the particles [i.e., ions] balance
each other. Magnesium carbonate is a perfectly good salt even if it
appears to the eye to lack crystallinity.
3. Urea is very stable in water. Solutions of it decompose
when ubiquitous bacteria containing the enzyme urease get into them. Urea
can cross cell membranes not only because it is an uncharged molecule, but also
because it is small enough. Glucose, which is also neutral but about three
times the size of urea, cannot.
4. You orchidophiles have strayed into territory best left
to those with technical backgrounds, but what does all this have to do with
orchid culture?
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