New growth coming in pale yellow while the veins stay green is iron chlorosis, and on CBD plants it almost always traces back to a pH above seven rather than a lack of iron in the soil. Adding chelated iron helps for a week, but the fix is bringing the pH down so the plant can use what is already there. The difference between iron, magnesium and nitrogen yellowing, which start on different leaves, is laid out on https://calmcbdseeds.com. Limestone rich garden soil is the usual culprit outdoors.
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