Got the grow going this year it’s budding at the moment. i seem to have an issue with my blue cookies plant. this issue is happening mostly to older leafs. I can’t seem to pin point exact problem so I’m here to get some help so I don’t mess her up with bad trials and errors. i have noticed that this plant doesn’t drink same amount of water as my other two in fact it takes less on regular basis. here’s the picture of leaf. the leaf of self is some what dried out and snaps off really easy. hopefully I can get little bit of help thanks for your time guys (p.s. thinking it’s phosphorus deff or excess ?)
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When I first saw this I thought Phos deficiency but I would have expected to see purple/black stems and leaves. I now want to say magnesium deficiency: interveinal yellowing and rust brown spots on older and middle aged leaves. Older leaves dry, curl up and drop off.
I believe if you get your pH right, feed the plant and water with Cal Mag + it will fix the issue.
It does look a bit like Phos deficiency- What is your PPM runoff or slurrie? looks like it could be a bit hungry as well- What type of drainage does the soil have? What is the pH?