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First grow, stress spotted, HELP

vaginacircus
vaginacircusstarted grow question 13d ago
My plant has turned very yellow this past week. Do you know why? I think it's light stress. I have an FC-E1500 that's 45cm away in a 60x60 tent. Am I doomed? growdiaries.com/diaries/267697-grow-journal-by-vaginacircus
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Dendegrow
Dendegrowanswered grow question 12d ago
You should definitely check the pH level of your soil. This looks like a clear phosphorus deficiency. If the leaf tips continue to burn, it's a strong sign of that. This can happen either because you’ve been flushing for too long or more likely because the pH has shifted due to watering with unregulated water, which can lead to nutrient lockout. So, check the soil pH. The easiest way is to take some distilled water, mix it with a small amount of your soil, stir it thoroughly, and then filter the mixture through a coffee filter. Measure the pH of the filtered water — that will give you a good idea of the actual pH in your soil.
John_Kramer
John_Krameranswered grow question 12d ago
don't lisen to him ) 24h for auto is the best schedule
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Organoman
Organomananswered grow question 12d ago
You grew for 6 weeks at 20/4, then went to a week at 18/6 and now a week at 24/0..........and you are wondering why your plant is acting weird?? 18/6 from day one to harvest is optimal. By slowing the plant down to 18/6, then accelerating it into over-drive at 24/0, you have forced it into cannabilizing itself, hence the yellow leaves........it is stripping itself of all available NPK due to being in overdrive. Nothing you can do now to "fix" anyhting, the damage is done and the plant will not magically get better, no matter what you do......there simply isn't enough time before harvest maturity. Be kind to your plant, go back to 18/6 and let her finish with the least amount of stress. Whatever you do, do not cut any leaves off and do not try to "cure" her with strange concoctions of fertilizers. Just continue on at a steady pace as to what you were feeding before, give her 18/6 and let her ride it out.
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Ratle
Ratleanswered grow question 13d ago
agree with others. Did tis start at the top, or bottom? The whole plant going yellow in a week is major. Your light distance is where mine is at this stage. Light stress wouldn't do this that quick that I have experienced. She will look this way if you did final flush and only water for two weeks. The sugar leaves are dying also, if there is any sign of cloudy trichomes you may be best to harvest and get what you get. Buds full of dead matter won't taste good. There's a lot of damage to try and recover from.
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Core_T_Son
Core_T_Sonanswered grow question 13d ago
Da stimmt die Calcium/Stickstoff Kombination nicht. Entweder durch falschen pH ausgesperrt oder durch zu viel/ zu wenig der kombin
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00110001001001111O
00110001001001111Oanswered grow question 13d ago
Are you 'flushing' the plant for harvest? fyi, does not impact composition of flower, because that's not how plant biology works. This clearly needs some nitrogen... also common for bro science sources to tell you that you don't need much of it in flower despite the plant obviously having a visible deficiency. ensure pH isn't too acidic, but most likely just need more N in your fertilization. If you lowered it or are flushing, you are doing that too soon as the plant obviously still needs building blocks to build molecules - like for cellular division and thca etc... this stuff doesn't come from nothing. law of conservation of mass.
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Kushycat
Kushycatanswered grow question 13d ago
Lightmix is already pre-fertilized and since the nutrient requirement for Autos is not so high, I would almost guess that they are over-fertilized. The burnt leaf edges would also suggest this.
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John_Kramer
John_Krameranswered grow question 13d ago
if u're feeding it properly then it's Ca excess and NPK+Mg lockout
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