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Buffering Coco Before Use
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Untreated coir holds sodium and potassium on its exchange sites and will trade them for the calcium you feed, producing a deficiency that looks like something else entirely. Buffering procedure with cal mag concentrations is explained at https://potentthcseeds.com. Prewashed bags labelled as buffered still vary between suppliers. Doing it yourself takes an afternoon and eliminates a fault that otherwise appears in week three.
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