Light burn or Nute deficiency? Pics and specs included.

D3monic

Well-Known Member
First off background.

Plants are ~ 14 days old and it's effecting both of them. Leaves where a lil curled last night but discoloration was not evident or I at least did not notice.

RH= 65-50% for veg. Once I turn on main ventilation it drops to around 40% will do this for flower.

CO2 supplementation with 5lb tank- no meter to measure CO2 so have at roughly 2bps which I realize is not a measurable increment.

Roots organic soil, perlite, light coco fiber, marical grow organic potting soil (small amount, switched to roots) and a tiny bit of ground charcoal .
1 gal smart pots.

Ferts are RODI water or aquarium water (from planted aquaria no chems) Sometimes I also add brightwell aquatics remineralize to my rodi water to get a tds of ~130 (I do this for my aquaria)

PH I need to double check but usually between 6-7. Unsure of soil, probe I bought sucks. Need to get a new one any recommendations?

Roots buddha grow ~ half strength for now.

Roots ancient amber- only dosed once and no foliar spray

light cycle 18/6

Now they recent changes....

Monday I added a blackstar 240 instead of the haight ppf-800 I was using. - According to my par readings the blackstar puts out almost 5x the par of haight. I had the light ~ 14" from top of plants.
This is what leads me to believe possible light burn or some kind of chlorophyll purge similar to coral purging their zooxanthellae/ bleaching in reaction to significant light changes.

Other possible change is the other day I stopped adding ferts because I was concerned that I may of been adding them too early in development and switched to just RODI water in an effort to flush excess nutrients which very well could of led me to a dificiancy.

I personally am leaning toward maybe phosphorus or manganese based on my cheat sheet but its hard to tell at this stage.

Anyhow, here these are worth 1000 words. Discoloration is much more pronounced under the red LED lighting. Don't mind the tiny tear in the leaf, that was human error.

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Stem pics for shits and giggles.

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Feel free to ROFL at my horrible first attempt at Mainlining that ended in a broken off branch and stupid twist ties that wont hold the branch down like its supposed to be. I need to find where the hell my plant wire is. This is why I ran a couple bagseed ahead of my real crop so I can practice these different methods without killing my good bud.

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Thoughts? Suggestions? Also... on the pic above, should I just lop off that side branch and mainline from the Y ?

 
Definitely a problem. It's called grower is too worried. Leave her alone, let her grow.

So are you saying this is normal? Doesn't look overly normal. Especially if the leaf tips are curling down and mildly crisper toward the tip? ..... I could careless if I kill these two. Hell that's what they are there for. I'm not worried but if I am doing something wrong or lacking something then I'd like to know... That's how people lean isn't it? It's not like I make a post about every time the wind blows . Hell not even first time the leaves have curled. Just concerned as to what could cause that kind of discoloration.

Sorry if my reply is jumbled, driving.
 
It seems like you have a slight deficiency in the cal/mag department. Its very very common for indoors. It begins with rusty spots and the it gets to the point where it seems like you have over fertilized your plant but in actuality its need more of cal/mag mainly magnesium. In a lot of cases the stems turn purple and leaves will discolor. This happens even more with ro water........

Btw whats the ph of soil? Dont remember if i read it......
 
To test ph for soil all you do is next time you have to water ph test the water thats going in the soil and when you start seeing the first signs of run off water at the bottom collect it and ph test that water..... and that shoukd tell you where the ph for soil is at more or less
 
Thanks, it's hard looking at the cheat sheet to discern differences in some of the dificiencies. I was thinking phosphorous or manganese. When I get home I will pull and post brightwells mineral % for the remineralize. Maybe we can come up with a good ppm range I should be adding to my fert solution.

 
Ok, so I tested my RODI water with my API freshwater master test kit.

PH was ~6 (as low as test goes) at 0ppm TDS

Remineralized the water to 300ppm, PH = 6.4

Ran water through a pot and collected water. PH= back down to ~6 or lower ... looks like the tannins are acidic in nature

To my understanding this is too low for growing in soil right? Should be 6.5-7 ?

I also added half strength buddha grow and tested and it had no discernible effect on PH

Testing my aquarium water...NOW, and = 7.6 Hmm ... looks like I should go back to using my aquaria to water and fertilize my plants. This will hopefully gently raise my soil PH without having to use dolomite (but I will next soil mix) and add a little bio-available nitrogen and maybe silica since there's ~ 300lbs of black beauty blasting sand in it.

Ill post back once I water from the aquaria and see what the tannins strip it down to. Hopefully right into range.

Not sure if this will raise my Cal-mag or Phos-mang but ill try it and see how they pull through....
 
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