--- okay, so one of these pots that was measured by the A8 probe and was OK or slightly high in alkalinity is now reading 5.0pH? Can you tell me specifically what is was before, and what you have added meantime since? The leaves at the top with that edge-in fade, could be Zn or maybe Cu defc. but not from pH lockout, they get more available with acidity, so probably a basic lack-of defc. there,... P will lock out fast under that pH though! ....pending confirmation and details, best thing to do is flush with 7.0+ water, something with hardness to it for the buffering minerals,... what's your tap water like? Hydrated lime is powerful stuff,
right now fast too! I wouldn't go that route first, do a flush, with Ca-Mg in it, and a dash of nutes in final pour,.. as for the defc. issue, you'll need a micronutrient supplement, Earth Juice Microblast is great,... but you're out of budget now, so that's going see worsening meantime,... Did you do the straight Promix test yet? ... when you see symptoms like this starting, don't wait so long to deal with them,... now you're in a real jam catch-22 problem, with badly off pH and a micronutrient defc..... adding more food will lower pH more, and flushing will strip what little is left in there until you can get feeds going again,... with immobile nute elements like Zn/Cu/Fe etc., fixing them via soil treatment is slow as is, better to do a foliar spray,... but you need the micronute supp', and wetting agent (like Coco-Wet) to do the fastest fix,... only using Optic Foliar Transport will get it in faster, and that's out too,...
