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Old 04-28-2016, 08:57 AM
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Ray Ray is offline
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Originally Posted by estación seca View Post
I think the point is not to use MSU formulated for one kind of water in the other kind of water or pH may be undesirable.

First, if you use the MSURO formula in water already containing minerals, it might not have any significant impact on the pH at all (depending on just how much-, and what's already in it). Using MSUWW formula in pure water may result in low pH, agreed.

However, the pH of the applied solution has far less impact on the pH of the rhizosphere than we might think, as the potting medium, the microorganisms that live in it, and plant also play huge roles in that. Try this:

Water and feed your plants normally, so the potting medium is saturated, then wait about 30 minutes or more for the pots to completely drain. Then, trickle a small amount of pure (distilled, RO, etc.) water over the surface of the medium - just enough to allow you to collect the small amount of "pour through" to test. That gives you the best assessment of the medium pH.

Do the same, but trickle a bit of your fertilizer solution through, and the result will be very close, if not identical. That's why I stopped bothering to test my solution, unless trying a new additive.

What will also shock you (it did, me) is that testing a variety of plants in the same medium can give you a wide range of results.
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