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SAFMAN
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I do use an RO and its a fresh new Merlin so the ppm is coming out only about 20. Thats why I use Cal Mag and Ive used everything else for years just now to GH instead of Botanicare grow and bloom I used to use in dirt. Im going to try to magic green I have heard of that and I have looked into the H and G stuff to. Just really cant figure out what the brown spotting is. Some places said Nitrogyn defficiency but thats not it with Nitrozyme that never happens. Guess Ill just flush em with the clear x and start fresh.
Listen to this guy he knows his shit ^^^First, let me qualify *my* answers by saying that I don't use rockwool, hydroton or straight hydro, I'm a coco-nut and soil-grower, using aerocloning. Second, let me qualify my answers by saying that, without seeing actual amounts of each product you're using, it looks to me like your numbers (pH & ppm, though you didn't share what conversion factor is being used) look pretty much SPOT ON to my coco-eyes.
Also, it's most helpful to get both overall photos of the plants as well as close-ups, because right now I want to know where those affected leaves came from. If they're from low down on the plant then they're showing a fairly classic Ca deficiency, with the beginnings of a Mg deficiency. If not, then I'm thrown.
I was having problem after problem with my grows specifically in the Ca/Mg department until I stopped using the combination products and went with separating out Ca and Mg. I haven't a clue why, I wish I saw the same success when using, say, Sensical or GO's Ca-Mg+ (because it smells good, has zero nitrogen and qualifies as organic), but I didn't. I honestly don't know why that was. Now I use a 6% Ca (OMRI product) and MgSO4 (Epsom salt) and the one problem I'm NOT having is Ca/Mg. LMAO!
In any event, I think you need more input from other hydro growers, you've gotten a whole bunch of different answers here, my personal opinion falls in the same category as Mr. Detroit, it's a Ca/Mg issue. Ca deficiency causes the spotting and necrotic bits (on older leaves, it's immobile so this is important to know). Mg deficiency causes, among other things, interveinal chlorosis (yellowing BETWEEN the leaf veins).
You can do a foliar app of one or both to try to tease them apart, quarter teaspoon per gallon of the MgSO4, and I'd probably do about 1 teaspoon per gallon of a Ca formula that's 3%-6% concentration. If you stop the progression, then you know you've found the problem. If it continues, then you may have either an uptake problem (the pH people are talking about, when in doubt I recalibrate my meter, do that at least once a month anyway, usually more often) or a toxicity. Toxicities of many elements can look almost exactly like deficiencies, which makes Dx really difficult.
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