Any idea what this is? Deficiency?

ddeck96

ddeck96

Well-Known Member
Noticed that some of the top/middle fan leaves have started getting this pale color between the veins and some brown/necrotic spots towards the ends of the leaves. Any idea what it could be?
Strain: Huckleberry (flipped 12/12 3 days ago)
Medium: RDWC hydro
Ph: 5.8
EC: 1.7
Water temp: 68F
Room temp: 73-75F
RH: 60% (dehumidifier broke, ordered a new one)
 

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ddeck96 said:
just to make sure I cover all my bases here, could it be excess of calcium?
Click to expand...
No. Calcium excess/toxicity doesn't cause the brown spots like that. That being said, the fact that you seem to have a Calcium deficiency doesn't necessarily mean you aren't giving the plant enough of it. Excess of other nutrients or ph problems can slow or stop the uptake of calcium regardless of how much you add. These may help...images.jpeg

pH-Cannabis-Nutrition-2.png
 
myke said:
How much calmag are you adding?
Click to expand...

3.5ml/gal
Im using AN Sensi, never used it before and some people say you need CalMag with it, some say u don’t. So I figured I’d add it at a reduced dose. I usually do 5ml/gal with flora trio.
 
I usually run 3-5 ml/gal on CalMag but your CalMag needs are determined by your tap water more so than your primary nutes. It won't hurt anything to bump it up.
 
ddeck96 said:
yeah I’m not using tap I use RO/DI - 0 ppm water
Click to expand...
I'd bump it up then. Are you following the bottle or did you modify the nute strength? Nano makes a good point about a calcium uptake problem being caused but pH or other nutrient issues but I'd start with the simple solution first. Give more CalMag and watch what happens for a few days. If nothing changes then you can dig deeper.
 
sf_frankie said:
I'd bump it up then. Are you following the bottle or did you modify the nute strength? Nano makes a good point about a calcium uptake problem being caused but pH or other nutrient issues but I'd start with the simple solution first. Give more CalMag and watch what happens for a few days. If nothing changes then you can dig deeper.
Click to expand...

I switched base nutes and there was some debate as to whether or not CalMag was needed with it so I lowered from 5ml to 3.5ml. On everything else I’m doing it as instructed tho. It’s definitely either too little calcium or too much of another nutrient because ph is very steady between 5.8-6.0.
 
ddeck96 said:
So if this were the case, how would I go about fixing this in a hydro set up?
Click to expand...
Trial and error. First I would just add epsom if your base nutes have calcium in already. There if that does nothing or gets worse then try just adding calcium. It takes time. Ea strain is different.
have you tried no calmag?
 
myke said:
Trial and error. First I would just add epsom if your base nutes have calcium in already. There if that does nothing or gets worse then try just adding calcium. It takes time. Ea strain is different.
have you tried no calmag?
Click to expand...

gotcha, yeah I tried no CalMag but this strain is just a CalMag hog. This is the 3rd time I’ve had issues with ca or mg deficiency this grow lol
 
ddeck96 said:
2x mars hydro SP-250s for veg
HLG scorpion Rspec for flower
Click to expand...
You will want to get your ambient Temps up if possible. Plants under LED tend to prefer a range closer to 78 to 84 degrees due to the lack of IR from led. I had problems a lot like yours when I first started growing under led and it went away completely once I raised my temps. Hopefully you have a way to get the ambient up without raising the temp of your reservoir.
 
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