Regulus wrote:If you use 5-5-7 fertilizer at 25% then your final concentration in N is not 47 ppm but 50/4 = 12.5 ppm. As I wrote on another forum, that may be barely stronger than "holy water". I mean, standard rain water may have an higher N content just by "falling" through the atmosphere and down the rain pipes
I use vinegar or phosphoric acid once in a while for mild acidification. Using a strong acid, like phosphoric or "similar", is a PITA because the pH can hardly be adjusted (overshoot). Vinegar is much easier to use as our standard commercial vinegar is 6% which is roughly 0.1 molar solution ... and acetic_acid/acetate is a buffer combination.
But standard I may also use an additional very low concentration of ammonium sulphate because, indeed, it has quick assimilation Nitrogen AND it can lower the pH to about 5.5. The big caveat is its content in Nitrogen which in NPK terms is 21-0-0. But it is dirt cheap as it is an N fertilizer in agriculture.
A long time ago I was using KH2PO4 for good buffering and lowering the pH as it has no N but only P & K but it is cost prohibitive.
EDit: PS .. The use of vinegar in watering techniques for cacti was documented in extenso in the CSSA by Elton Roberts and Malcolm Burleigh many years ago and there are a couple of addenda. For the use on Mesembs I found a very short mention in the MSG bulletin not very long ago (by S Hammer) .. as if they just came to discover it !
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