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What do you guys think is wrong with my leaves? I ...

AvoidantGrower
AvoidantGrowerstarted grow question 7 years ago
What do you guys think is wrong with my leaves? I think it's lightburn because it seems especially bad and concentrated directly under the grow light but then again I see some off these spots far away from the light so I'm unsure. Over-fertilization maybe? Mostly on canopy level
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Week 9
Leaves. Other
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Jeff123fish
Jeff123fishanswered grow question 7 years ago
Light burn would only affect the portions of the plant closest to the light. What you have here is nute burn. 73 ml/gal is a lot I would flush this plant as quickly as possible to prevent it from killing your whole grow. Even if you didn’t see any problems in the past. The salts from these types of fertilizers will build up creating a toxic environment within your soil.
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Stick
Stickanswered grow question 6 years ago
As @Jeff123fish said, this seems to be a nutrients burn, your mix is too hot. I would flush the plant for 5-7 days and remove every leaf that has already turned brown/dry. Then we'll see how it's going on your next update ! I'll be around, good luck with this baby bro !
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schmorgastheborg
schmorgastheborganswered grow question 7 years ago
looks like a nutrient deficiency in the advanced stage. Kinda looks like low Mag and Potassium. At this stage and with the healthy undergrowth you may not want to even treat it. But if you do, do it mildly.
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DudeGrowsWeed
DudeGrowsWeedanswered grow question 7 years ago
Looks like LED burn to me. I had the same thing when my LED’s were 16-18” from the canopy (seemed more severe under my LED with more reds for flowering). I’ve since raised the LED’s to be 24-30” above and don’t see issues like this anymore with new growth. The damaged leaves will not change back to green but you should stop seeing new leaves affected.
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