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Discoloration on a few mid level leaves - Cal/Mag Deficiency?
BiggBizzstarted grow question 4 years ago
Looks like cal mag deficiency on the leaves. Can someone confirm? Using QB LEDs (sf4000) - feeding liquid almost every day / every other day, always watering with at least 1ml/gallon of TPS Cal Mag. Should I increase to 2-3ml/gallon? Thank you.
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Leaves. Color - Dark-brown
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Stonerdanswered grow question 4 years ago
To me it looks like a Calcium (Ca) Toxicity! - Top and mid foliage shows blotching and dark coloration, lower and mid foliage shows signs of Potassium (K) and Magnesium (Mg) deficiencies (Calcium toxicity inhibits Potassium, Magnesium, Iron, and Manganese uptake) *Those deficiencies show as interveinal chlorosis, tip and margin chlorosis, and blotching.
I'd stop using the "CalMag OAC" since your "MEGA CROP" has more than enough!
*Remember Calcium is a micro-nutrient!! it is needed in small amounts and it is easy to cause a toxicity.
Hope this helps! Good luck and happy growing :)
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Robertsanswered grow question 4 years ago
Make sure your end part of run off ph is in range. That can mask itself as other issues.
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Robertsanswered grow question 4 years ago
Yes cal mag. I would hit 3. If there is coco coir in substrate it absorbs cal mag so always have to use extra. Bigger plants call for more as well. Happy growing and enjoy the harvest. 👊
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