Can you identify the deficiency?

Joe.Grow said:

I run this
25ML micro

Ph down to 6.

Always make sure your PH pen is accurate and your comfortable with its results. Even I’m guilty of trusting a pen for too long and messing up some plants. I’m not saying it’s what’s happening here but anything’s possible.

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Chip Green said:

Having a few older lower leaves start to die of is not necessarily a bad thing. Certainly nothing to lose your noodle over, I don't get the impression you are.... IMO it just means you are feeding JUST enough.
That's one reason I hardly ever cut off any leaves, the plant will cannibalize itself, letting me get it back into balance before it begins to suffer too much. I gave one good sized plant in Coco N tox one time, went completely sideways, twisted growth, some branches started flowering, ever since then I been somewhat guilty of underfeeding...

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Tuckatan said:

Thanks for the input bud. I have two ph pens which I calibrate every couple of weeks and use both when testing PH because I’m paranoid, and litmus paper for when I don’t trust either!

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Tuckatan said:

Hi guys, wanted some of your expert opinions on this showing in slightly older leaves, new growth appears unaffected so far.

Week 5 veg - red cherry berry - barneys farm.

Rain water - starting ppm around 35
18/6
250w hps
Lights on 26c RH 60%
Lights off 20c RH 70%
Cana coco pro plus with 30% perlite
5 gal fabric pot (just potted up)
GH trio nutes + cal mag
Calmag 5ml/gallon
Micro 2.5m/gallon
Gro 2.5ml/gallon
Bloom 1.25ml/gallon
Straight rain water with cal mag every other water always with 20% runoff

Have fed really cold (3/4c) water twice.

PH feed/water I vary between 5.5/6.0/6.3
PPM usually around the 550’s with run off ph usually around 0.5/0.7 oh higher.

This leaf was taken from mid plant, with no new growth appearing affected. It is worth noting that for the first 2/3 weeks of feeding, I didn’t alternate with straight water with cal mag.

Any idea what I’m seeing? It doesn’t appear as though it’s a massive issue, and this leaf (and it’s opposite) had started yellowing before I noticed the brown spots.

Any opinions welcome!

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curious2garden said:

What is your rain water PPM? Take new pictures without the HPS please. What is your substrate?

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polishpollack said:

It looks like it's not getting enough food. You only fed once?

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chef123 said:

The leaves look like they had some Cal. def. to me (maybe bit of Mag. def as well, but just a guess because i cant see the lower part of your plant).
Overall they look like they need more grow juice and a steady cal/mag absorption

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Tuckatan said:

Lol noo dude, i don’t know where you got that from. I feed nutrients in the levels in the original post, and straight water with calmag every other feed... oh maybe that’s the confusion! I don’t mean every other feed has been water lol I mean I alternate, one feed, one water, one feed, one water etc lol.

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curious2garden said:

Better pictures, thank you.

Try feeding every watering. It looks like you are multi-deficient, also a Zinc deficiency However what you are feeding should be enough. Try feeding every watering and keep your pH at 5.8 but don't float higher than 6.0 and water temp 65-75.

Interesting information: https://www.ilovegrowingmarijuana.com/marijuana-nutrient-deficiency-zinc/

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macsnax said:

I don't think you're feeding as much as you think you are, that plant is hungry. Calibrate your ph meter just to make sure, but that plant needs more food. A plant at that stage should be good at about 1.0 EC or 500 ppm on the 500 scale, 700 on the 700 scale.... You could skip the water and calmag for a feed, feed, feed schedule, that should make a difference.

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