Had my soil tested a few months back and everything came back within normal range, nitrogen, phosphorus, potassium all fine. But I had got several plants with yellowing leaves, starting from the bottom and working up, and it doesn't look like typical nitrogen deficiency based on what I had read. Watering seems consistent, no standing water or drainage issues that I can see. Soil drains at a normal rate when I do a basic perc test.

I wonder if this could be a micronutrient issue that a standard test would not catch, or something related to soil biology rather than straight nutrient content. Not sure if it worth paying for a more detailed test or if there something more obvious I should check first.

I have a 25L pot i need to flush to get my ph back to around 6-6,5, so how do I do it best and easiest?

Does 25L of water gonna make it?

Can I mix my ph:d water with Cannazym when I make the flush?