Sigh, more nutrient issues

Lucky Luke said:

This NPK of 2-1-1 could be a concern to, that looks more like a veg than a flower. Looks like a phosphorus deffinency to me but im not the best at diagnosing problems.

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That's why I'm sure his ph is off from pouring that super low ph EJ in. Phosphorus drops to a pretty narrow band at low ph locking it out.

I know it's so repetitive with growing cannabis and everyone goes back to it but even I myself see first hand. More often than not, it's a PH issue..

Yup, it definitely sounds like a ph issue to me. Giving them the nitrogen boost was my attempt at reducing the # of leaves yellowing and falling off towards the bottom but I'm not suprised that it only made it worse. They'll get a watering at around 6.5 (unless recommended otherwise), and the next feeding will be Bloom.

Could be a boron or phos deficiency. Just googled boron deficiency in cannabis plants the pics that came up look similar to the pics you have shown. Also this link is helpful https://www.royalqueenseeds.com/blog-cannabis-nutrient-and-deficiency-table-n88. Happy growing. GL

BudgetGrows said:

I know it's so repetitive with growing cannabis and everyone goes back to it but even I myself see first hand. More often than not, it's a PH issue..

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What's funny is he stated and I confirmed he was watering with something with a ph of 4 anyone running good soil knows, Soil can buffer but only to an extent anything repeative in any direction of the ph scale can and will screw with its ability to handle the buffering of the ph to a suitable level. I find it funny when ppl say it's deficient add x amount of this to it when yes it's lacking but let's find the underlying reason it's lacking in the first place. any grower should know the make up of their soil thus why I have a la motte soil testing kit tells me the literal amount of shit lol in my soil and if you know it's not lacking then there's of course some reason it's not able to access those nutrients already there. Dumping more will only end up making your medium more screwed up in the long run and all that time, effort and money invested into a grow will be for nothing. @Blenko420 , @SchweeDubz

Ps hope this help and having a soil ph meter on hand is always a good idea.

Well, I can't afford any more tools than I have at the moment but I watered today at ph 6.5 and my run off was actually 6.7-7 between the 5 plants. So, I don't know, hopefully things don't get worse...

I have the same sort of thing. It's almost completely gone now, but I had no luck diagnosing it in another forum. I can say it wasn't Ph in my case. It wasnt environment as it only affected one plant, there are 4 others 3 the same strain. I think it's quite possibly a boron issue, or something silly like that. I'd love to see a definitive answer to this.

Yours looks more like a micro def. No yellowing. Boron most likely. The one I can never narrow down and might not even be a Def. Is the brand new growth that's bright yellow on a perfectly healthy plant with good PH. I have one currently...



They darken before lights out. In Less than 12 hours.

I thought that was what the new growth looks like.

Lordhooha is possibly right, I've used earth juice for years before and one thing i notice is if you don't bubble your feeds then it can strip the buffers out of the soil rather quickly, so keep that in mind.

I've done a few grows with pouring EJ diluted straight in but by the time chop came around my soil could no longer hold pH and thats with a GOOD amount added prior, enough to crust the bottom of my soil.

The two best ways I've found using EJ's lineup was to moderately feed with EVERY watering or bubble the heavy feeds for 24 hours.

Good luck.

Stltoed said:

I thought that was what the new growth looks like.

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Never had it like that before. But it could be...

Xs121 said:

What I think is happening since the symptom is at the top, your rh is too low for that kind of temp and is drying out the leaves. The plant is experiencing rapid evaporation and have a hard time cooling the upper leaves thus the drying/browning parts of the leaves similar to nute burn.

Do you have a fan going? If so, turn it off for a while and let rh go up.

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It Has NOTHING to do with RH.

My plants go in temps from 80 -85
with r/h ranging 40-60 and have none of those issues.

Try keeping a room at 75 rh at temps of 80 or even temps lower slightly lower. For one carbon filters stop working after rh @ 70 rh being used constantly after awhile.

SchweeDubz said:

Roughly 3 weeks into flowering, buds are coming in nice but over the last 48 hrs I am seeing these brown spots appear rather quickly and I'm a bit worried. I have noticed it coming in visibly stronger over the last 12 hours. Looks to me like potassium or calmag defficiency.

Not sure why this would be, other than they got fed the other day with 5tbsp of Grow per gallon. I don't see any symptoms of excess nitrogen though. I know the ph of the Earthjuice mix is low but my understanding is the soil handles this. Any thoughts? Best route moving forward? Thanks.

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Get a scope / loupe examin the plant leaf and look for bugs. If you see none great, you know its nutrient deficiency..

There are a good amount of charts out their that break down the symtoms of plants that are suffering
The general
NPK
Cal
Mag
and few others...

Lightgreen2k said:

It Has NOTHING to do with RH.

My plants go in temps from 80 -85
with r/h ranging 40-60 and have none of those issues.

Try keeping a room at 75 rh at temps of 80 or even temps lower slightly lower. For one carbon filters stop working after rh @ 70 rh being used constantly after awhile.



View attachment 4012877

Get a scope / loupe examin the plant leaf and look for bugs. If you see none great, you know its nutrient deficiency..

There are a good amount of charts out their that break down the symtoms of plants that are suffering
The general
NPK
Cal
Mag
and few others...

Click to expand...

My environment is almost identical to yours. I don't usually see 85, but 82 all day long. Same humidity fluctuation. I don't have any bugs. This thing is a nute issue.

Stltoed said:

My environment is almost identical to yours. I don't usually see 85, but 82 all day long. Same humidity fluctuation. I don't have any bugs. This thing is a nute issue.

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I can get my r/h to 80 if I wanted, but again after 70 the filter starts to clog. My temps are actually between 73-83.

Lightgreen2k said:

I can get my r/h to 80 if I wanted, but again after 70 the filter starts to clog. My temps are actually between 73-83.

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My AC chills my reservoir. I can't let it go too high, but my light manufacturer recommends the room by 85 degrees. If i do that, then my res. Temp will go higher than 70.