Can anyone help me what is this?
Disease Diagnosis/HelpLooks like magnesium, if you're feeding calmg or it's in your mix its probably a pH issue.
This is like a textbook photo of magnesium deficiency.
Magnesium deficiency...whole heartedly without a doubt, hands down....1 tsp of epsom salt per gallon of water for the next 3‐4 weeks. You can also use as foliar for quicker results...spray right before lights off. Older leaves won't bounce back, so look at new growth. If there's no change....you need to look at the soil. You may be locked out. If that's the case....look up how to flush the soil. They're pretty resilient plants. She'll be fine.
I had the same issue with my autos. I never was able to fully correct it, but in hindsight Id suggest increasing the calmag or just magnesium
Magnesium requires calcium for uptake and vice versa. Its always recommended to feed both together, which is why its sold as a single supplement via CalMag
You should always treat calcium and magnesium separately.
As a Cannabis grower, you MUST know this is wrong, correct?
Please explain to me why you think you are right
My father went to Horticultural College in Toronto, graduating top of his class. Owned a Landscaping business for 3 decades, and has been growing cannabis for a long time. and taught me everything I know via his textbooks and experience.
I, in turn, have been Growing cannabis for 8 years. While experimenting with everything from natural compost tea, Miracle Grow, Fox Farm, Advanced Nutrients, no name hardwarestore garbage to no amendments at all. I have worked on deficiencies via foliar spray and soil-based nutrients. Calcium, taken on its own makes the plant strong. The acids from this process build up in the plants. Magnesium is required to remove these, and form them into sugars via photosynthesis. If you do not have a proper ratio, then this symbiotic relationship is not being used to its most efficient state.
Lol you just gave more reasons as to why they should be treated separately.. Would you like me to give you more?
Hit me
You have to take into consideration how elements interact with each other. You have synergistic relationships and antagonistic relationships. If you treat calcium and magnesium the same...ie use calmag, you are possibly antagonizing other elements at certain concentrations. So, calcium, magnesium and potassium are all cations. Too much of one will inhibit the uptake of another. Now, you may start to see deficiencies when there are actually sufficient quantities present in the soil. If you have sufficient calcium and add calmag, you may antagonize the uptake of K. Even like you said, everything needs to be in a proper ratio. Dealing with calcium and magnesium "the same" ...ie just adding 5ml or whatever of calmag just isn't the right move. You need to add calcium and magnesium, individually, in whatever ratio you need them. Not treat them together. Then we can get into nitrates vs sulfates and it goes on and on. So, synopsis...treat calcium and magnesium separately so you aren't antagonizing other elements.
Thanks for the time to respond. You’re absolutely correct about the adverse relationship to Potassium that CalMag has, an abundance of either would inhibit Potassium as much as the blend.
This adversity is why growers typically feed CalMag on opposite weeks as fertilizer. So the peak supply of NPK in the soil is not inhibited by an abundance of CalMag. Tomatoes are done in a similar fashion, but typically 2-week intervals instead of 1.
I respect your way of doing things, while simultaneously maintaining the validity of what I said. Thanks for sharing.
Mag deficiency, my bet would be pH is off or unstable. Calibrate pH meter and check run off pH
just apply a foliar spray with magnesium sulphate 2g/L
Epsom salts. 1 Tablespoon per gallon for the first feed, then drop to 1 teaspoon for the next 3-4. Make sure it’s 100% pure. No scents or additives. Magnesium deficiency
The magnesium deficiency (interveinal chlorosis) this plant is showing most likely due to a high PH issue coupled with your lights being a bit too close; the curling upward leaves indicate a high heat environment or strong light exposure from LED’s.
Flush with water that has no nutrients that is around 6.0-6.4 PH to approximately 30% runoff. Test the runoff so it is no higher than 6.5. Within a few days after this soak you will see the new growth healthy and pushing the chlorosis outward from the inner leaf.
I would also do a foliar spray with the same PH tested water with Epsom salts, at lukewarm temperature. The ratio should be a teaspoon of Epsom salts to a gallon of water. Then mist the plant a bit heavy and it should also start taking care of the magnesium deficiency if it isn’t primarily a PH issue.
Remember to apply the foliar spray during the dark period (if on 24/0 light schedule i.e. autoflowers-turn off lights for a one hour period to spray). I would avoid Cal-Mag for the time being as there is no signs of calcium deficiency, just Epsom salt foliar spray or mixing it into the soil during transplant for example (tablespoon for every gallon of soil).
After application have patience. The recovery process is not instantaneous and requires maintenance. Good luck and I hope this helps!
More cal-mag
Did you even try to look at all the photos and charts all over the internet?
Nitrogen diffencencies start of
Cranking those led at max aren't ya
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