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Deficient or toxicity

J

Jsimo

New member
So I've got a few of these leaves in only one of my bucket setups affecting the two plants, different strains in that setup. The other setup is doing fine but that one also has two plants of the same strain. When i first noticed it I checked ph and ppm. Ph was good, ppm was down to about half of my other setup. So i did a full res change to get things back to the same. That would lead me to believe it's a deficiency, and it does look somewhat like a potassium deficiency, but i also read that's hard to do in hydro. And the leaves affected after more toward the top of the plant, haven't found anything at the bottom affected yet, but they're mostly older top leaves. I'm not sure if it's taken care of yet or not, since i saw some leaves today that i don't remember being there last night. Anyone have any ideas? One picture is earlier stage, one picture is later.

Forgot to mention, about 3.5 weeks into 12/12
 

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My system so far has been, ph to 5.5 before transferring to emptied resevoir, usually after a night in there reservoir it'll raise to about 6.3-6.4 (not sure if that has to do with the temp change or being oxigenated but I've always had a ph rise after a res change) but after the initial rise, i run into gradual ph drops generally throughout the flowering phase. Usually as the water level goes down the ph does as well, so i top off with non ph'd water (about 7.5) which will bring my overall ph back up to around 6.2 and that's generally where i sit, bouncing between 6.2 and 5.7ish. i do check my ph every morning and almost every night as I'm still learning and babysitting these things and being overcautious. And i also have to top off with fresh water about every two days.
 
Because potassium is highly mobile within the plant tissue its deficiency starts at eadg of the lower leaves.

if u see the symptom in active growing part of the plant it can be Calcium deficiency.

too much P and K, high RH and low temperature are the main reasons of Ca deficiency.
 
Water temps are around 72f in the reservoir. Usually i mix my solution and it sits for a day or so before i change out the reservoir so the water I'm putting in is probably 5 degrees colder and warms up once in the system.
 
I did give it a half dose of calimagic this round, my base water is about 150ppm already so i wasnt sure if i should go with a full dose. I'm still confused at how my ppm dropped so hard in this line, unless i somehow completely forgot to add something. I'll have to check tonight to see if the leaves got any worse or if there's more of them even after the res change. Just a little nervous trying to figure out what's actually wrong in case it's still an issue.
 
Temperature is a bit high for DO levels to be optimized. Plus, temp flux leads to PH flux. So my guess is that’s causing your issue. Control the water temps to gain control of PH. I believe the issue will clear up after that.
 
I haven't looked at the roots in a little while, the water doesn't have any bad smells to it though, but I'll check the roots to be sure tonight. It's only been a few leafs so far, maybe 4 or 5 per plant. I do run hydroguard, and recently started using great white as well to try to keep the roots healthy
 
I may be able to wrap my buckets in some of that foiled bubble wrap stuff, i do have some extra. I keep them on the cement floor to try to keep them cool.
 
Understood, but you are hitting 72... so wrapping them will not suffice. You need to lower the ambient or chill the water.
 
Well a chiller isnt in the budget right now. I could throw my pumps on a timer to reduce the heat from those, and i could possibly run them external as well, wouldn't take much to do that and might drop a degree or two. The cement floor is probably 65 degrees so i figured isolating the bucket from the ambient heat a bit more wouldn't hurt, the room itself is usually around 75 degrees
 
Yes, get those pumps out of the water and run them inline if you can. For sure!
Depending on how your system is set up, yes...running the pumps on a recycle timer (costs like $30) could be an option.
 
When was the last time you flushed the roots? I used to run into the same problem a few weeks into flower and it drove me nuts. I started giving the roots a 24 hr flush before I flipped to 12/12 and again 1/2 way through flower, I haven’t had the issue since. It could be the start of a lockout or salt build up. Periodically flushing the roots is a good practice to maintain a happy and healthy root system.

72F is not a high enough water temp to cause any noticeable issues or drops in DO levels. 72F is the target temp for my reservoirs and I haven’t experienced root rot, poor growth, or any other negative effects. I actually run a small aquarium heater in my reservoir so I can keep a fairly consistent 70-72F. Far too much is made of the temperature of the water. Dissolved oxygen levels are what matters and they won’t fall below acceptable levels until the water temp exceeds 75F.
 
72 is up there bro. You are not reaching the DO maximum potential above. Can lead to issues, consider yourself to be lucky to avoid issues at these temps. Not everyone is this fortunate though. Check out the chart I attached. At 68 major drops in DO.
https://www.usgs.gov/media/images/temperature-affects-dissolved-oxygen-concentrations
I never let mine go above 68 because it’s counterproductive to have such little DO in the water.
I copied and pasted this from the website we are all chatting on...
“Many growers aim for their reservoir water to be between 60-68°F because cooler reservoir temps prevent some bad organisms from growing in the first place, and cool water can hold more dissolved oxygen in the 60-70°F range.”
https://www.growweedeasy.com/deep-water-culture-faqs

And there is also this one stating the same. I’m sure I can find more supporting data on this subject.
http://www.just4growers.com/stream/h...d-answers.aspx
 

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I don't usually do a flush, i may have to also add that into the regimen for sure, currently changing water is a bit of a pain but i try to do it every week or two. Before the next plants go into flower I'm going to tap into a water line and install a faucet right in my mixing area. So i won't be so turned off by carrying 5 gallon buckets of water back and forth. I may do a flush if things aren't looking up, lights will be back on in about 15 minutes so i can take a look
 
Not seeing anything too concerning as far as roots go, and no bad smells at all. the problem hasn't seemed to have gotten any worse but it was the dark cycle all day so tomorrow might give me a better idea
 

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