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https://www.sciencedirect.com/science/article/abs/pii/S0376871620304750

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Hi @robert194622!

So, you might have an excess of phosphorus which is encouraging yellow growth, but it could be cal/mag deficiency too. Using cal/mag should reduce phosphorus uptake and supplement magnesium to help the leaves turn greener. You should have plenty of nitrogen, maybe too much and maybe too much P from the black kow. Since it isn't in full swing grow mode yet pull back on the ferts and let it leaf out a little bit.

Bump