Toxicity/deficiency/pH problem?

Hi!

My plants are in the 8th week from germination (4th flowering) and they are showing these signs.

Griwing in soil
100W LED at 70%
Feeding them 50% strength tripart nutrients by terra aquatica
pH in: 6.5
pH out 6.2
Ppm in ~450-500
Ppm out ~ 800

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I’m no expert Grumpy, but here’s my thinking;

Ph is fine, feeding at 50%, and you have a deficiency. I would work my way up to 100% on your feed strength. If she deficient let’s give her the nutes she needs.

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Increasing your nutes is also likely to drop that ph down closer to 6.0 - which might also be beneficial.

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Forgot do add that I have been giving them calmag with every watering.

Thought that calcium gets locked out at ~ pH6.2

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Well I don’t know man, I use hempy buckets and bring my ph down to 6 in every water, never had a calcium issue. If I was in your shoes, I’d go to 75% strength on the nutes.

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Thanks man! Already went to 75% on the last feeding. Let’s see what happens!

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i can see in this pic more is always better, the leaves are really green you are in week 4 of flower your plants are hungry for something other than N they seem to have plenty tips are nipped a bit as well i think they want K you are using a three part mix reduce the vegg part of the mix and replace it with more P and K part of the mix

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just my take on it… ppms going in are lower than coming out… ph is lower coming out than going in… i would water only the next few irrigations. the deficency(lockout possibly) looks to my like calcium and that would be from a low ph i think, ph in at 6.5 and out at 6.2 would tell me the ph in your media(soil) is closer to 5.8-6.0 much to low for soil.

Edit. Ppm lower going in(changed from higher)

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Flushed 2 plants to lower the pH.
Let’s see what happens.

The buds look good… i think.

It looks like a ruderalis weed.

Well it is autoflowering. So… yes! This is my first run.

Will go with photos next time.

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Trust me, I’ve been there. Let me know if you need seeds.

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Is there so big a difference?

Was planning to buy some for the next run, in august. Are you in Europe?

No but growdiaries.com has contests from a lot of euro seedbanks.
Im sure many have good references here.

Thanks for the heads up, will check it out :slight_smile:

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