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Any ideas on what's going on with NL-2? Fan l...
G_mang_0started grow question 5 years ago
Any ideas on what's going on with NL-2? Fan leaves are discoloring, interesting pattern. From Websites, I'm thinking a potassium problem, but am not sure. And am not sure how to correct this close to harvest (3 weeks give or take). Thoughts?
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motaman311answered grow question 5 years ago
I think it is a magnesium issue, possibly some calcium as well. You are using a lot of P and K especially with The Open Sesame. The other nutrients contain high amounts of phosphorus and potassium as well. Potassium and calcium are two nutrients that can cause magnesium lock-out when added in excess. Excessive Potassium blocks the absorption of calcium, magnesium, zinc and iron. It is a game of ratio's that you must play and when you add 1 thing it effects another. Happy growing! 👊
DankGardeneranswered grow question 5 years ago
With a marijuana potassium deficiency, you’ll generally see symptoms on older leaves, but not always. Sometimes you’ll see the symptoms at the top of the plant. Leaves with a potassium deficiency get yellow, brown, or burnt edges and tips. The burnt edges may look a little like nutrient burn, except the affected leaves also start turning yellow in the margins. But if your this close to harvest I wouldn't worry. Try lowering your pH to 6.1 potassium is best absorbed at a lower pH.
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Fruitgroweranswered grow question 5 years ago
I would say it's a cal mag issue, you're not providing any call mag on your nutrients and it s does provide some very important minerals not just calcium and magnesium. So you pain water every now and then. Might be worth flushing out and adding some call mag to your next feed.
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