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Rust spots on lower leaves
GrowersParadisestarted grow question 2 years ago
rust spots on lower leaves on mainly one strain, started at tip of leaf. Happened after res change and had PH swings during that time until it was adjusted/settled. Full EC again. PH swing? Maybe cal(or)mag issue? PH is back at 5.9 now, running bennies. Maybe Slightly droopy?
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Hashyanswered grow question 2 years ago
Looks like a slight lack of calcium. Not a massive deficiency. Either give the leaves a mist with a weak cal mag solution or increase calmag in the res slightly. Maybe lower Ec to 5.8 until flower so more nutes are available. Good luck
GrowersParadiseanswered grow question 2 years ago
I originally thought it was cal and added some into the system. Rusting has worsened slightly, but it’s only been 24 hours. I let the PH slightly rise to 5.9 figuring it would give the plant access to (slightly anyway) more calcium.
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