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Looks to me like beginning of nute burn where on the plant are you noticing these leaves? Too much K will also brown leaves. Deficiencies will usually start with the leaf turning light green also noticed the tips are showing signs that they are maxed out. I could be wrong not sure your what your feeding schedule is but I dont thing by the looks that you are that off from the sweet zone
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it started doing it after a scoop of recharge was added. but im feeding once every two weeks and plane ph 6.5 water the rest of the time.the grow shop told me to use the maxi grow line up on the autos. this is the third try with autos im beginning to think it might be the maxi bloom nutes. im just tring to use them up then ill be going back to fox farms for soil autos until im out of auto seeds.
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Your soil probably has the bacteria it needs right now this late in the grow, I would use it in veg but not in flower. Product seems to be geared toward the bacteria if I'm in flower I would be more concerned about fungi
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