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An out of range pH buffer will lock out minerals in any media. It’s almost always the reason plants lack nutrition. Often times heavy feeding from veg through mid flower can cause a salt build up if allowed to dry back too much too often tanking pH.
frostygardner420 -
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Synthetic is tough. As an organic grower some of the lower leaves will always Yellow in bloom. The mobile nutrients in the bigger fan leaves will always move where needed.
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Immobile nutrient deficiency help
Check the run off pH after watering to make sure it’s also in range.
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