My seedlings are yellowing once again - Why am I cursed with this?

[013]

Hmm overwater perhaps?

Tilt the airpot to a steep 45 degree angle, prop it up so it won’t tumble over. Leave it propped up at the steep angle for couple hours and it will force her to pee out the excess water.

Temps are off, the closer you get to 84 F the smoother your plants will run.

Still don’t know crap about biobizz so I’m going to ask @bluter to stop in

 

[bluter]

afraid i lost the story on this a while ago. seemed everything was rolling along decent. i'm not a big fan of biobizz. there are folk here using it, but it seems more prevalent in the uk and other parts of europe.

offhand it looks like it is suffocating and possibly not fed proper. sort of a theme. also needs to be suspended above the drain tray. looks like it should have been flipped a ways back too.

temps, rh, etc, aren't perfect but it's nothing that is a huge issue.

 

[Roy Growin]

BioBizz line is fine, but their nute schedule is screwy; works ok for 20L/5Gal + pots but anything less and you'll run into problems
After a couple of weeks you can treat the soil as 'coco, but less water', and never go more than 5-6ml/L combined nute/additive [3ml Gro/1ml Bloom - 3ml Bloom/1ml Gro]
Good idea to rinse the soil [water/H2O2] every 4 weeks to keep it fresh

 

[Wastei]

Way to much light for the stage of growth. Less is more in veg regarding light intensity.

Save your money and your plants will thank you accordingly.

As other suggested get your pots lifted of the runoff trays even though there's a gap in the airpots. You need better air circulation going along the pot and soil surface.

 

[Acid]

The pot is raised, it just looks a bit "funky" I do use pot raisers, they just seem invisible in this image.

FYI - This problem needs no "background knowledge". All old problems are gone, have been for a long time. I just went back here because I didn't wanna open up another thread for this, this is a completely different problem to the old ones.

The plant hasn't been watered for ~4 days until yesterday, as I got used to its schedule rather nicely. I learned how to water slowly, especially because these are airpots, they're a bit annoying to water.

I then watered the plant yesterday as scheduled, because it suddenly looked like in that image above and the pot was rather light, a bit too light for my liking, but not **extremely** dry. It was extremely droopy though. I watered, but as of today, it still looks extremely droopy, as if something just happened out of nowhere.

The plant was 100% healthy and well fed until yesterday. This was my plant around 5 days ago and 3 days ago:

As you can see, totally healthy, 100% picture perfect green, it just looks a bit funky here and there because I did some LST and defoliation that day, and 2 days later it already all grew back. This plant was thriving like nothing I've ever experienced in other grows before, and yesterday it just completely broke down out of nowhere.

Just as a quick example again, this is today:

It can't be overwatered, it's impossible. It looked like this when it was dry and ready to water, and now it still looks like this after being watered more than 24 hours ago. Tilting doesn't help, it's all just fine inside there apparently, if we talk about water quantity. I sadly can't raise temps, 24°C is currently the maximum I can get out of that tent.

For PPFD, I thought 500 is already on the low side in late veg?

 

[Wastei]

The pot is raised, it just looks a bit "funky" I do use pot raisers, they just seem invisible in this image.

FYI - This problem needs no "background knowledge". All old problems are gone, have been for a long time. I just went back here because I didn't wanna open up another thread for this, this is a completely different problem to the old ones.

The plant hasn't been watered for ~4 days until yesterday, as I got used to its schedule rather nicely. I learned how to water slowly, especially because these are airpots, they're a bit annoying to water.

I then watered the plant yesterday as scheduled, because it suddenly looked like in that image above and the pot was rather light, a bit too light for my liking, but not **extremely** dry. It was extremely droopy though. I watered, but as of today, it still looks extremely droopy, as if something just happened out of nowhere.

The plant was 100% healthy and well fed until yesterday. This was my plant around 5 days ago and 3 days ago:

As you can see, totally healthy, 100% picture perfect green, it just looks a bit funky here and there because I did some LST and defoliation that day, and 2 days later it already all grew back. This plant was thriving like nothing I've ever experienced in other grows before, and yesterday it just completely broke down out of nowhere.

Just as a quick example again, this is today:

It can't be overwatered, it's impossible. It looked like this when it was dry and ready to water, and now it still looks like this after being watered more than 24 hours ago. Tilting doesn't help, it's all just fine inside there apparently, if we talk about water quantity. I sadly can't raise temps, 24°C is currently the maximum I can get out of that tent.

For PPFD, I thought 500 is already on the low side in late veg?

That's not 100% healthy in my book. I see both miniaturization and excess shoot forming, both indicators of excess light in veg.

The plant is seeking coverage and you need to adjust your environment accordingly. One thing you can do if you haven't already is to change light schedule from 24/24 to 18/6 while keeping current enviromental measures. That will better your use of light and help de-stress the plant.

 

[013]

totally my bad Acid, I tend to forget that you have perhaps added a metric crapton of perlite so I’m thinking it’s the old overwater thing all along when it actually could be the underwater thing instead…

funny thing about the tilting the container deal. You can tilt one way (say to the right hand side) and after while she will stop dripping and you think great she’s done. But then if you tilt her to the left side and prop it she will start up peeing again… it’s amazing how much water a soil mix can hold

Anywho hope all is well elsewhere in your garden

 

[Acid]

totally my bad Acid, I tend to forget that you have perhaps added a metric crapton of perlite so I’m thinking it’s the old overwater thing all along when it actually could be the underwater thing instead…

funny thing about the tilting the container deal. You can tilt one way (say to the right hand side) and after while she will stop dripping and you think great she’s done. But then if you tilt her to the left side and prop it she will start up peeing again… it’s amazing how much water a soil mix can hold

Anywho hope all is well elsewhere in your garden

No, the current plant is in plain biobizz, no extra perlite in this case. It's my last biobizz grow, just wanted to get rid of it.

As of today, the plant looks even worse. I changed to 20/4 as a middle ground which is usually the cycle everyone runs with autos, and lowered PPFD to 300 yesterday, also made sure it's correct by using my physical PAR / DLI reader. I'm just confused. It's like no other problem I've ever had before. The pot is heavy like freshly watered, there is water in it, I just opened one side of the airpot as it's pretty easy without disturbing anything, the roots look fine and pruned, and the substrate is moist from top to bottom, but not overly soaked. No dripping when I tilt it, nothing.

I also don't remember anything else I might have done. It got fed as usual, it became dry as usual, and suddenly it drooped out of nowhere, I watered it, and it gets worse and worse

Edit: Pulled her out of the tent for some clearer images

 

[SmokinRasta]

I'm new on Air Pots, but my five cents on this: it looks for me like too much water.

I'm not useing these pots for long, but I never had a run off during or after watering.
If I'm right, you have to water in little steps. Thats the way I do it.
Lift the pots after and before watering to get a feeling for their weight.

I'd take them off the trays and place a fan blowing on the bottom to get air to the pots.

 

[Acid]

Update - All good again. I don't know what happened, can't explain it, didn't find any solution. It just went away on its own over the span of almost 2 weeks. She still grew, she drank normally, but kept drooping down - and it's a beast now. Considering that this is an autoflower, I feel like she'll be a big one soon.

I also have several seedlings in 60/40 coco/perlite running in the background, they're slowly creeping their way up to 850ppm / 1.7EC early on, feeding twice a day til runoff at around 5.8-6PH. I never imagined that this would work, but apparently it does just fine. I also boosted my temps into the 84°F range, with high humidity, and as soon as I did that, they exploded in growth rates.

Everything seems to slowly work out!

 

[013]

Looking fine, it’s always nice to hear back and see positive results.

Way to go on hound dogging the problems

 

[Acid]

FYI - This problem below has nothing to do with the thread, I just don't want to create a new topic for this quick question here.

So something is weird again - It's only 2 of the same strain (Acid Snow, Speedrunseeds). The other two are 100% fine. I just transplanted them into their final autopots yesterday evening, the problems have been present for 4 days now, worsening every day.

They are in a 60/40 Coco/Perlite mix, prebuffered, washed coco, 100% ready to use. I feed them with RO water + 0.4EC Calmag + 1.2EC Canna Coco A+B for a total EC of 1.6, they take it just fine as I slowly raised the input with multiple fertigations in their solo cups (16oz cups). Everything went smooth as hell.

But as of 4 days ago, they show these weird yellow spots / interveinal chlorosis. I thought it's a mag deficiency at first, but it starts looking VERY different to me now. The symptoms are worsening, top growth seems a bit funky too.

I thought it's because of my PH, as I usually fed between 5.7-5.8PH. I heard you have to vary from 5.8 to 6.1, which is what I then did as of 3 days ago, but it's still worsening. The runoff EC read just fine at 0.1EC more than input, but PH read at 5.6PH runoff, which is when I started feeding a higher PH here and there, until I read a runoff of 5.8-5.9PH.

Any ideas? I have never seen this kind of deficiency

 

[bluter]

stop chasing runoff. it's your inputs that matter. feed at a a constant 5.8 you have a calmag issue made worse by bouncing the ph around.

 

[Acid]

stop chasing runoff. it's your inputs that matter. feed at a a constant 5.8 you have a calmag issue made worse by bouncing the ph around.

The problem appeared while I kept my input PH at 5.7-5.8 steady, in 9 out of 10 cases at 5.8, which is why I started changing the PH up a bit afterwards

 

[bluter]

The problem appeared while I kept my input PH at 5.7-5.8 steady, in 9 out of 10 cases at 5.8, which is why I started changing the PH up a bit afterwards

don't mess around with the ph. always feed at 5.8. increase your calmag a little.

 

[SmokinRasta]

I thought it's a mag deficiency at first, but it starts looking VERY different to me now. The symptoms are worsening, top growth seems a bit funky too.

Mg def was the first I thought, too. But for me it does look different for me.
I have less Mg in my water so I take Canna MONO Mg to correct it. Since I use this, I don't have any problems and don't even need CalMag till now. - Don't know if I'm right, but I think I remember haveing read somewhere, that you should only use CalMag once a week.

What about a beginning nitrogen deficiency?

 

[bluter]

Don't know if I'm right, but I think I remember haveing read somewhere, that you should only use CalMag once a week.

you can add calmag at every feed or watering.

What about a beginning nitrogen deficiency?

the entire leaf pales evenly in N def. calmag normally carries the N it would be missing as well.

 

[Acid]

Mg def was the first I thought, too. But for me it does look different for me.
I have less Mg in my water so I take Canna MONO Mg to correct it. Since I use this, I don't have any problems and don't even need CalMag till now. - Don't know if I'm right, but I think I remember haveing read somewhere, that you should only use CalMag once a week.

What about a beginning nitrogen deficiency?

Yeah I have nothing in my water, it's empty (RO). If I use this, it'd strip out the nutrients in the coco which my plants need, which is why I use calmag in every watering. I just wanted full control over this grow, as the pipes in this house are ~100 years old.

don't mess around with the ph. always feed at 5.8. increase your calmag a little.

So keep PH at 5.8, and go for even higher EC with calmag? I'm already at 0.4EC with it. I use Canna Calmag Agent and it has 5% nitrogen (I just noticed this high N ratio, damn), 6.8% Calcium, and 2.4% Magnesium

 

[bluter]

So keep PH at 5.8, and go for even higher EC with calmag?

increase calmag slightly. don't change any of the other nute amounts for now. watch how the plants react. it won't reverse the damage already caused but it should arrest any more going forward.

 

[SmokingWings]

I use Canna Calmag Agent and it has 5% nitrogen (I just noticed this high N ratio, damn), 6.8% Calcium, and 2.4% Magnesium

The Nitrogen rate is not a problem. I have noticed that many Cal-Mag producers include some N with their product and 5% is common. Providing Nitrogen certainly beats seeing early signs of yellowing leaves caused by a premature N deficiency as soon as a couple of weeks after flowering starts.