Loopusmagpie2u
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Apogee ppfd meterWhat are you using to measure PPFD? I don't see how you can be light burning at a honest 300 PPFD.
Lights are 3’ away and its a hlg 550 dimmed down to like 40%How close is the light and what kind of light?
No its not horrible right now but it gets worst as it goes on if I dont dim. And the dimmed light kills my yield. The entire line of nectar for the gods is calcium based so im feeding a lot of calcium.That doesn't look horrible and to me it looks like the slight Calcium deificency
Yea there pretty old ive topped them a few times because i dont want to flip until there 100% healthyHow old and big are the plants -- are they at least 4-5 weeks old?
Chem has a point. Some plants are finnicky some aren't.I don’t during veg, they don’t really like it. I put it to em (100%) by the end of first week or so of 12/12.
Looks like a feeding problem to me,maybe your mix is bad?My rooms conditions are spot on with vpd, co2 and feeding regimen. Any time i try to get lights in the optimal ppfd range all my leaf tips turn over and turn yellow on all my new growth. My room is 82* 72%rh 1200 co2. Im growing in soil with nectar for the gods. My soil slurries are 6.5ph and 400ppm. Im in late veg and I cant get lights over 250ppfd. I turned them up to 300ppfd and this is what happensView attachment 1263036View attachment 1263037View attachment 1263038
Interesting I was going off this chart pic for environments. Ill lower rh.As you increase light, plant processes increase.
Photosynthesis (assuming you have CO2 and H2O present in sufficient qty 6CO2 + 6H2O → C6H12O6 + 6O2) CO2 yes, H2O good?
Respiration
Other stuff
I think you might be looking at an issue in the root zone that is exacerbated and only shows up with higher respiration.
Also your RH is a bit high making VPD a bit low, meaning the stomata are open but there is so much water in the air that there is not good gas exchange. If you increase the lights, temp goes up meaning RH goes down, VPD goes up, so respiration is restored. In that scenario, if your nutes were out of balance or not enough O2 in root zone, it could look like this and it is not really PPFD doing it, but rather the higher leaf temps and lower RH.
I'm thinking that if your VPD was on point and your watering / nutes / root zone oxygenation was all perfect you could bring that light way up.
It's a friggin balancing act man.
TLDR - I think the problem is actually in the root zone.
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