Originally Posted by
Corneu
Let me take a crack at this lol. First what's your ph going in. There are people out there that say ph in soil doesnt matter, I say they're crazy. Ph is always important anyways if it's not ph I do have a theory.
So idk about calcium, but as far as I'm concerned the only nutrient deficiency this could be is magnesium. And if a magnesium supplement didnt work it has to be 1 of 2 things. Too much P or K (your feed is low in P so I wouldn't worry about that one) or high PH. The reason I say this is because too much P or K can hinder the uptake of calcium, magnesium, iron, and zinc. Also too much K will acidify the root zone which could cause similar issues. But plagron is a 3-1-3 fert so if you have K excess I'd imagine you'd have N excess as well, which you don't. Unless that strain is K sensitive.
So in short you're either overfeeding or have a ph problem. Give her a flush with Ph'd water. 6.2-6.6 in soil idk what it is for hydro, I know it's about a full point lower. After the flush, drop down to 2.5 or 3ml per liter with the plagron and keep feeding the calmag at half or 1/4 strength to be safe.
That's just what I would do, hopefully my input helps some
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