Im 52 days from seed and i have this. does anyone know what it could be im using all fox farm materials i beleive im using humbolt seeds 3 gal. Photoperiod
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A pic of the whole plant will help. Whats ur runnoff ph and ppm
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The restbof the plant looks really good.
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By the diagram I see phosphorus def. Are you tracking #s in and out?
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Only in, i rarely have runoff. I did a flush about 2 weeks ago and my ec was 1.5 today it was 2.5
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I think your right it does look similar to pic of phosphorus deficiency
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It doesn’t look terrible. As @Mmanson1981 said, plant looks pretty healthy otherwise.
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Thank you i beleive i know what to do now.
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I believe with Fox Farms nutes you need to water to a decent runoff to avoid salt buildup and nute lockout. I believe @Lostgirl is the runoff guru so tagging in. Happy growing 
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You should feed to liberal run off with synthetic fertilizer Growmie. Not doing so will create an accumulation of salts in the root zone and can tank the PH. This plant has a potassium deficiency and most likely PH related, looks heavy on the nitrogen as well. Follow a drench to drought routine with liberal run off on feed days with soil 
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I can’t see a darn thing wrong with this plant and I kinda know my deficiencies. I heard P & K mentioned but where? Not that single lower leaf with excess burns?
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Looks more excess salt buildup related as you say.
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Agree, does the leaf pic above not resemble a potassium deficiency. Either way the rest the foliage looks healthy
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The pic with yellow edges yes. Says below. The not K refers to your pic from OP
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That’s exactly what it is. Do to inaccurate runoff.
They look like they’re in 3 or 5 gallon pots. With synthetic nutrients especially Fox farm you should be mixing at least 1-1/2 gallons of feed/water per girl every time you feed/water to get the proper run off.
You should also be checking the runoff every time you feed/water documenting your runoffs PPM and pH as runoff dictates how much your next feed should be… you want to obtain and maintain as close to 1,000 PPM and 6.5 pH as you possibly can. Doing this will definitely clear your issue.
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Thanks again, i got alot of info here and ill be implementing after next flush, the deficiency isn’t wide spread so ill wait till the soil dries out before i flush and adjust my watering method. Ill update yall with the results.
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