Where is this thread? White tips could also be glyphosate.
One should understand where this magic 6.2 pH comes from. Which is pretty much for all plants, just that some have lower requirements, but it is possible that some plants have a better way to locally control pH around the roots. So it comes from iron in hydroponics, where iron edta is used, and this has a good availability up to that value. Soil is a different thing, there are natural chelators (humic acids), so same rules don't apply (up to pH 8 one should still be quite ok). Also in hydroponics, there are other ways like EDDHA, DTPA, which are stable at higher pH.
That being said, I think the easiest way to correct iron also in soil is with iron eddha, since it is stable to a high pH, and is available for sale (more or less difficult depending where you live). Certainly easier than trying to lower soil pH.
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