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Tip burns and some spots on the leaves

RoomForBloom
RoomForBloomstarted grow question 21d ago
I have encountered some tip burns and on a few leaves I have these rusty spots. My first thought was CalMag deficiency? Flower Week 5 | BioBizz Schedule | 340w SANlight LED on 70% (238w) | 2 Circulation Ventis | 6" Exhaust w/ Carbon Filter | GrowController on low VPD-Mode
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Leaves. Tips - Burnt
Leaves. Other
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John_Kramer
John_Krameranswered grow question 21d ago
yes and N excess agreed with Ultraviolet
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Ultraviolet
Ultravioletanswered grow question 21d ago
Been feeding organic nitrogen every week of veg and 4 weeks into flower, that's probably not a good idea, lots and lots of ammonia, the plant uses less and less nitrogen as flower ramps up, the microorganisms ramp up and release more nitrogen until the ratio of nutrients skews ph, that's where your nitrogen tox is from, your tips are also showing clear signs of the medium having too high salt concentration. Give your plant a good, solid flush with lots more water than you normally would; the ammoniacal nitrogen will need 3-5 times more water to separate it completely from soil particles. Once stripped of everything, ph back between 6-7 then go back to feeding a regular flower feeding, making sure to control the EC of your medium, no more bio grow.
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John_Kramer
John_Krameranswered grow question 21d ago
Mg excess, Ca,K,P lock
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