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Plant Diagnosis

S

sweeper91

New member
Hello, can someone help me ID this issue? pH at 5.9, air temp ranges from 72 to 82 F, rez temp ranges from 60-74 F, RH ranges from 44-57% (have to run AC to keep temps down), EC currently at 0.5, plant is a few weeks old. Noticing leaf discoloration and slight curling. Using quantum boards at 15K lux. Any input? Thanks!
 

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Not much of a hydro guy so with a gain of salt advice to bumping your thread we go. Pretty earily on and i had to look hard twice to pick things out.

First thing I'm thinking is you are in the Very early stage of yellowing between the veins, what it could become would be listed here.
https://www.growweedeasy.com/cannabis-symptoms-pictures

.5 ec seems low but i dont practice ec on the regular to be reliable.

Some fat stubby leaf and strange shapes caught my eye but iv had a lot of that just grow out of itself, keep a eye on it.
light distance and wattage isnt listed? That could be a factor. I would think that 60f is a little low for the rez, do you have a chllier? And why is it swinging so much?
 
I think it looks ok but maybe my eyes are just not what they used to be. Just make sure you are letting ph flux as some nutrients can only be uptaken in hydro with ph of 6.0 or higher. Also .5 ec does seem a bit low if you are using tap water. I use RO water and my ec at that stage is about the same ec but if i were using tap water it should be a little higher. The curling you talk about to me looks more like wrinkling than curling which can be because of low rh in veg which is not ideal but wont kill the plant.
 
Thanks for the input. rez temp swings so much because I use ice bottles to keep the rez temps down. I've seen some roots from previous grows that were too brown for comfort, and it makes sense because the rez temp was pushing 78 F with 80-82 air temp (ideal for quantum boards).
as far as 0.5 EC, that was a guideline given to me by another grower i trust. i will keep track of it and add more nutes if necessary.
based on photos from GWE I'm thinking this is an early Magnesium deficiency. Yellow between veins and a red stem... Makes sense given that I've mostly kept the pH in the 5.5-6.0 range
 
Good question, I'm using Hydroguard at the moment. I use ice bottles to keep the rez temps low...previous grows they were pushing as high as 78 F, which makes sense given the ideal 80-82 air temps that plants under quantum boards like. I added some more photos and now think this is a magnesium deficiency...yellowing between veins and at least one red stem.
though perhaps slightly brown roots indicates this is also a root issue causing nute issues? any input on that is appreciated! roots look mostly white and healthy, though a few of them do look a little too brown for comfort...I'll keep an eye on them
 
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Great points. I've been mostly keeping the pH below 6.0 (noobie here, probably adjusting the pH too many times instead of letting it flux more) and after posting some more photos i'm seeing yellowing between veins and at least one red stem, which might indicate a magnesium deficiency. I will keep pH in the 6.0-6.5 range for at least a week and observe the new growth.
as far as 0.5 EC, that was based on a recommendation for starting EC from a grower I trust, but you are correct that that is low, especially since my tap is 0.3 EC. It's hard to tell but plant overall may be a little light in color, which could indicate need for more nutes. I will keep track of EC to see if it declines in coming week and add more nutes as necessary.
Good point about the wrinkling, the RH sometimes drops as low as 46% when the AC is on, usually hovers around 52% or so which is def on the lower end for Veg. Thanks again for your input!
 
sweeper91 A good way to test if feed is too high or low is to compare ec readings between feeds. By this i mean on your next res change take EC of fresh res water, then after a couple days take ec again and see if it has gone up, down or stayed the same. What you want is for it to stay the same while the water goes down as this means you have the correct ratio of feed to water. If EC goes up then that means you have too much nutes as it is drinking more than it is eating. If it goes down then you need more nutes. It is easier honestly to use PPM in this case as it is easier to see a difference in that form, ppms having more digits if that makes sense. (.5 EC being 250ppm depending on the scale used).
 
yes, I'll keep track, thanks again. Btw, if I end up needing to supplement with mag, do you think it's okay to mix nute lines? currently using Dyna-Gro but they only make a magnesium supplement, not a cal-mag one...maybe there is enough calcium in their Grow formula?
 
It should be fine to mix nute lines with cal mag supplements. I dont know about dyna grow personally but it does look like it has some cal mag in it, but not a lot of magnesium. Since you are using tap water you may not need any supplements. I personally use it cause i use RO water. Aslo epsom salts have a good dose of magnesium and lots of growers use it as a supplement for magnesium.
 
I added a little Mag-Pro to the rez and the plant appears to have perked up a bit. I'll continue to monitor in coming weeks. Surprised that my tap doesn't supply enough, but I guess it just depends on the water--maybe it's more filtered than i thought?? Anyways, thanks again for the input :)
 
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