Mainly looking for ease of use. I have super phosphate (0-9-0-11), Potash (0-0-41-17) and microbe booster (4-1-1) here, would I be better off just messing around with these?
I would take one of the complete fertilizers (or the micro bottle from a complete fertilizer) and tweak it with the phosphate/potash/microbe booster to get the ratio you're looking for. But I grow in Coco so that's how I get my micros. Soil might not care as much.