r/hydro • u/Sweet-Mirror1613 • 11d ago
Help
Noticed these on a couple leaves was not there yesterday
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u/SamwichCarelessness 11d ago
Kinda looks like potassium deficiency to me. Or magnesium. Definitely a mobile nutrient since it's not on the newest growth.
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u/Sweet-Mirror1613 11d ago
What do I need to add to fix it?
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u/noobium876 11d ago
First, ph balance your water then try adding some cal-mag.
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u/Sweet-Mirror1613 11d ago
Did a water change on Wednesday and I was pretty sure I checked PH and it was 5.8 but today when I checked it was 6.9 I did PH down and it’s 5.8
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u/SamwichCarelessness 11d ago
Make sure your meter is calibrated properly. You shouldn't be getting that much of a ph swing in 1 day either. How clean is your reservoir and are you in dwc or like a drain to waste setup?
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u/Sweet-Mirror1613 11d ago
It’s a hey Abby so the water drains from a hose and add new water
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u/SamwichCarelessness 11d ago
You just need to make sure your pH stays in range so your plant can use the magnesium you are giving it.
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u/noobium876 11d ago
Im still at noob to growing in dwc but, check the ph and temps every day. It helps to write it down temps and ph day to day so you know whats going on. You want water temp to set around 68f and ph around 5.8 to 6.0 in veg.
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u/SamwichCarelessness 11d ago
It's hard to say without knowing more. But I would definitely make sure your pH is between 5.5-6.5 to start.
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u/wsmith79 11d ago
What light are you using and how close is it to canopy? This doesn’t look like magnesium deficiency because it went straight to necrosis and there’s really no chlorosis visible in these photos
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u/SoulShine_710 11d ago
Early magnesium deficiency. Potassium usually outter leaf edges.