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potassium K or late Phosphorus deficiency Possibly?

Huskiehouse
Huskiehousestarted grow question 2d ago
Is this a last stage of Phos deficiency/ Ca? Or just a potassium K deficiency?I wait until soil is dry b/ watering + always check w/ digital instruments so should not be overwatering. Redcng to nutes once a week, should I flush or no? Ph at 6.7, or just reduce + use only big bud
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Week 4
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HandsomeTerpz
HandsomeTerpzanswered grow question 2d ago
The leaf damage looks more like potassium deficiency (K) than phosphorus or calcium the rusty, burned edges are typical for K issues. Phosphorus usually shows darker/purplish tones, and calcium more spotty necrosis. With pH at 6.7 you’re on the upper end, so nutrient uptake might already be limited. Personally, I always keep it around 6.0–6.3 max for better balance. Since K, Ca, and Mg are often hard to tell apart and interact with each other, I’d supply all three components together instead of guessing just one. No need to flush unless you’ve overfed better to adjust feedings and ensure a steady base instead of only using Big Bud
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00110001001001111O
00110001001001111Oanswered grow question 2d ago
Looks more like a root zone / irragation issue. Waiting for a proper dryback is good, but are you fully saturating the medium? If you are choosing a volume to give and not giving what is needed to fully saturate, that's likely theproblem. i would not do a 'flush' but maybe get a little extra runoff for an irriation or 2. Feed as you normally would. you amened some peat moss, so how you fertilize is a supplementation of what remains in the soil... like riding a bike, you have to figure that out on your own. The plants don't look lush, so i doubt you are over-feeding. i would not reduce feed but if symptoms continue, change formula of feed for sure. again, i think this is more about the root zone. the damage is all around the veins to start. Check any marijuana leaf symptom chart and you'll see this is difficult to match up to anything... the location and progression don't match. the plant doesn't look overly lush and you say the pH is balanced (6.7 is fine for soil).
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John_Kramer
John_Krameranswered grow question 2d ago
actually P def is already fixed, new growth is fine but Ca def still there
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