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lezhonka started grow question 3 years ago
Having persistent yellow/brown spots on my leaves. Took a close up picture to show them better. I adjusted my nutrient schedule to increase phosphorus content. pH is checked daily. What else can I do to eliminate the problem?
White Widow Auto
14 weeks
White Widow Auto lezhonka
White Widow Autoflower
41 comments · 3 years ago
Week 9
Leaves. Color - Mottling
The_Projexx answered grow question 3 years ago
To me your just over feeding them abit . I would slow down on the amount of nutrients fed not the strength but the amount . Instead of watering them every time with nutrients try doing it 2-3 times . Your leaves look really dark which is a good sign of nitrogen toxicity like every is talking about but there are no signs of burns . I would also recommend only using Bloom solution this way you can be assured that its the same every time . Not that this will have a huge effect if your monitoring it but some nutrient systems don't mix well . I would also reduce the amount of CalMg being fed your aren't running into any deficiency of either . This will hopefully correct any lock outs you have . I hope you find this information useful . -Happy Growing!
BeefWellingtons answered grow question 3 years ago
I think the tiny spots on the leaves look like potassium deficiency based on this chart:
mad_scientist answered grow question 3 years ago
Hello @lezhonka! What you have is a slight nitrogen toxicity and a calcium deficiency. Two possible reasons for that. First because of too much nitrogen the calcium can't be absorbed ( very common thing to plants with excess nitrogen ). Second the PH is wrong. How often you replace the water in the bucket? What you need to do is first make sure to calibrate your PH and EC meter ( a lot of people forgets to do it and they taking repeatedly wrong measurements ). Then measure the PH into the bucket. If the PH is wrong replace with fresh water at 6 PH and 1.6 ms/cm ( 3.27 ms/cm is way to much even if you were using AN) . If the PH in the bucket goes out again very soon you can tell me so we can find whats causing that ( there is no reason to explain you what can cause this if you don't have that problem since it can be to complicated some times ) or you can ignore it and start changing the water very often. Also you need to stop using floralicius because it gives more nitrogen and you are close to harvest. Happy growing ! :+1:
Removed answered grow question 3 years ago
Wow, that's some strong nute solution. Dial back the nitrogen, your foliage shows signs of nitrogen toxicity (really dark leaves). As for the spots, do you notice that the affected leaves are the ones on top? That means that it's an inmobile element issue, in this case calcium; I suspect nutrient lockout, both phosphorous and potassium excess can lockout calcium. Good luck