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start of week 3

LCF15
LCF15started grow question 2h ago
Hello, I have a question. I'd like to know what the problem might be, a deficiency or excess, because I'm finding this issue in several plants and I'm wondering if it might be due to my substrate, since I make it myself.
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Leaves. Color - Yellow
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Ultraviolet
Ultravioletanswered grow question 3m ago
Looks like something is affecting the big 3 cations, symptoms look like a mush mash of what I'd expect from iron deficiency (Fe) or sometimes magnesium (Mg) causes classic interveinal chlorosis (yellow between green veins), often on new growth. Maybe a symptom of early K. I'd be leaning more to a lockout. Nitrogen in its nh4+ form can antagonize Ca,MG and K. Impossible to be accurate without more info. Unless you have been bombing her with calmag or K I'd be looking at possibly N causing lockout of big 3. Nh4+ is generally found in much higher quantities when using organic delivery methods. Maintaining a stable pH is crucial for the nitrification of nh4+ . If pH is off even a bit the micros will just continue to breakdown and ccumulate nh4+ in a medium which will contribute more and more over time to a skewed ph. Rate of nitrtrification of nitrogen iirc is 3x4x the rate at a Ph of 7, as opposed to a ph of 6. In a perfect world you wanna hold 6.4 to 6.6 to unlock hydrogen but soon as she drifts to 6.2 or lower the breakdown of nh4+ into no3- will almost cease entirely. Ammoniacal nh4+ will take around 4 or 5 times more water to separate from soil particles. What you do is up to you. Gluck.
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