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Nutrient Burn, Leaf Septoria, Nutrient Deficiency? Or something else?

BigGing432
BigGing432started grow question 4 years ago
I have been having issues with the Purple Haze. I've tried adjusting the Temperatures, adding additional Cal-Mag, changing lumen intensity etc. I believe this may be nutrient burn? Added an old image of leaf before mainlining, the plant is 1 week old after mainlining was done.
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Week 2
Leaves. Color - Yellow
Leaves. Color - Black or grey
Roots. Too few
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Shagrath
Shagrathanswered grow question 4 years ago
Hi! Are you blasting that led at full power all the time? Seedlings and young plants don't need that much power and they can't even handle it that well, so it might be that you have been given too much light for them and they are stressing out. Also 24hrs light can be very stresfull to plants and even so if they are stressed to begin with. Your ec is 1.7 and humidity at 40% so you have been giving quite alot of nutes and your VPD (Temp/Humidity ratio) is way off 'cos they would like to be at 60-70%% in veg state and even 80% when seedling. pH is little bit high for hydro BUT if you are using "bennies" (Beneficial bacteria and mycorhizzae) you can also grow "bioponic" and you can grow with higher pH than normal, but I don't think thats the case rn. Dilute your reservoir to 1.1-1.5 Ec Lower your pH to 5.5-6.0 and keep it there Raise humidity to ATLEAST 55% better yet 70% Change light cycle to ATLEAST 20/4 or better yet 18/6 for a week to ease the stress and give them some rest Raise the light 24" or as high as can if 24" cant be reached With these you should see them grow much healthier and better in after about a week or so
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Shagrath
Shagrathanswered grow question 4 years ago
I see you are actually using bennies with hydroguard and voodoo juice, but there is still so many things out of place so try to maintain optimum balance in pH nevertheless. Bacteria needs some food to survive longer so they need carbohydrates, like an bg bud or just humic acid or blackstrapmolasses or even the water you used to boil rice, pasta, potatoes etc. Bacteria will suffer or even die if the environment (your water resrvoir) goes through big changes all of sudden. So if you want to keep the bacteria alive, don't change pH or Ec too quickly and never change your whole reservoir at once. This bioponic is whole new chapter in hydro grow so I suggest that you stick to basics for now but you can use the products still, but dont stress about them too much
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smoke24
smoke24answered grow question 4 years ago
I notice a couple things: a 6.4 ph is a little high for dwc, 5.9 would be better. Also the nutrient ratio is off, you have equal amounts of bloom, gro, and micro. Check this feed chart for general hydroponics nutrients. https://gh.growgh.com/docs/Feedcharts/GH_FloraSeries-REC_03216am.pdf Happy growing.
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