Yellowing seedlings

[LearningMore]

It seems that you went out and got great stuff to grow with and then Kinda an odd soil. I would guess it is a soil problem. You might have let them dry out to much as well. I personally would start over. I would pick a soil that is not loaded with organics if I was going to use the nutes you have chosen.

I have found a place 90 minutes away with Happy Frog. I will give this a try.

 

[Tom Bombadil]

They make this soil with different things depending on the region. There is no way they dont have enough food to draw from the soil, so you either have a ph issue, a bad watering schedule/method, or the soil is just too darn hot and they are struggling. Anything with established roots would probably be fine, but the roots of a new seedling are very fragile. If they used chicken manure in your area to produce this soil it could be pretty potent or just hasn't had time to break down properly. Happy frog will give them 3 weeks or so without amending...
GL

 

[Mañ'O'Green]

I have used the Kellogg products in my vegetable garden and I would think that this would be too hot to grow cannabis especially seedlings. I usually lay it down in the fall so it has all winter to work into the soil.

Then you put some recharge in and revved that engine and the plants get burned. People just do not understand how recharge and other products like them can magnify the available nutrients in a nutrient rich soil already. Conversely if you apply recharge and a top dressing to a soil that is almost spent then you get more mileage to get across the finish line.

The only thing to do now is just water them and see if they can pull through.

 

[LearningMore]

They make this soil with different things depending on the region. There is no way they dont have enough food to draw from the soil, so you either have a ph issue, a bad watering schedule/method, or the soil is just too darn hot and they are struggling. Anything with established roots would probably be fine, but the roots of a new seedling are very fragile. If they used chicken manure in your area to produce this soil it could be pretty potent or just hasn't had time to break down properly. Happy frog will give them 3 weeks or so without amending...
GL

Thank you. I will change how I water, as pH going in I know is ok (Or do I need to check pH of soil??

 

[LearningMore]

I have used the Kellogg products in my vegetable garden and I would think that this would be too hot to grow cannabis especially seedlings. I usually lay it down in the fall so it has all winter to work into the soil.

Then you put some recharge in and revved that engine and the plants get burned. People just do not understand how recharge and other products like them can magnify the available nutrients in a nutrient rich soil already. Conversely if you apply recharge and a top dressing to a soil that is almost spent then you get more mileage to get across the finish line.

The only thing to do now is just water them and see if they can pull through.

“Guaranteed not to burn” definitely gave me too much confidence that it was “harmless”. What you describe makes sense. I appreciate the explanation.

 

[Fitzy]

I haven’t used any nutes yet, though. Where I live, soil options are limited (alternative was extended release miracle grow). I’ve read extensively on soils, trying to understand what the issue could be so I could try to address it. It doesn’t seem “hot”, so would nutes be better earlier? pH going in is correct - should I water to runoff to see that pH? I thought runoff pH mattered more in coco than soil, so I haven’t checked that yet and am unsure what the ”target pH” would be.

Try taking a single pot flush it but capture the run off test the ppm and ph lmk wat you find they look hungry in my experience if soil is to hot they wouldn't have make it this far. As for feed I wouldn't just use wat ever ratio I would measure ec/ppm as these plants wouldn't be able to handel more than 200ppm to 250ppm and that maybe a bit high even. When doing run off test use 6.5ph water to flush with and see what ph a ect/rods before and after, if ph has drifted it will be difficult or impossible for the plant to uptake nutes.

 

[LearningMore]

Try taking a single pot flush it but capture the run off test the ppm and ph lmk wat you find they look hungry in my experience if soil is to hot they wouldn't have make it this far. As for feed I wouldn't just use wat ever ratio I would measure ec/ppm as these plants wouldn't be able to handel more than 200ppm to 250ppm and that maybe a bit high even. When doing run off test use 6.5ph water to flush with and see what ph a ect/rods before and after, if ph has drifted it will be difficult or impossible for the plant to uptake nutes.

So before I headed out to pick up the new soil, I decided to run an experiment and give 1/4 strength nutes (TDS was 350 even at 1/4) to a couple of the plants. I ran the flush test as you advised now, a few hours later:
Water in: pH 6.5 TDS 151
Water out of pot that did NOT get nutes this morning: pH 7.55 TDS 695
Water out of pot that DID get nutes today: pH 7.37 TDS 595

Thanks for the ppm guidance - I will go purely by that in the future as I start up.

So based on the flush, my soil pH seems high? The lower TDS of the non-nuted pot seems strange, but it hasn’t been watered in a couple days, versus the water in the nutes, so would that explain it?

Should I do a water flush on every nuted plant now? How do I raise the pH to see if that “unlocks” the nutes?

Thank you so much for your help.

 

[Mañ'O'Green]

So before I headed out to pick up the new soil, I decided to run an experiment and give 1/4 strength nutes (TDS was 350 even at 1/4) to a couple of the plants. I ran the flush test as you advised now, a few hours later:
Water in: pH 6.5 TDS 151
Water out of pot that did NOT get nutes this morning: pH 7.55 TDS 695
Water out of pot that DID get nutes today: pH 7.37 TDS 595

Thanks for the ppm guidance - I will go purely by that in the future as I start up.

So based on the flush, my soil pH seems high? The lower TDS of the non-nuted pot seems strange, but it hasn’t been watered in a couple days, versus the water in the nutes, so would that explain it?

Should I do a water flush on every nuted plant now? How do I raise the pH to see if that “unlocks” the nutes?

Thank you so much for your help.

Flushing soil is not a good idea. The elemental balance is in organic components that do not rinse out of the pot evenly like over fertigated salts in hydro type media. Then what happens is you end up with a pot much further out of balance than it was to begin with. Without a long baseline of observations run-off is notoriously inaccurate. Baselines will give you a trend but also not very useful as any damage to a plant has happened before you get the results.

Do not worry about the PH in a soil pot. It generally has plenty of buffering power. Just continue to fertigate/water at 6.4 PH.

Stop reacting to the problem it cannot be easily fixed and may just balance itself out if you just LITFA.

 

[LearningMore]

Flushing soil is not a good idea. The elemental balance is in organic components that do not rinse out of the pot evenly like over fertigated salts in hydro type media. Then what happens is you end up with a pot much further out of balance than it was to begin with. Without a long baseline of observations run-off is notoriously inaccurate. Baselines will give you a trend but also not very useful as any damage to a plant has happened before you get the results.

Do not worry about the PH in a soil pot. It generally has plenty of buffering power. Just continue to fertigate/water at 6.4 PH.

Stop reacting to the problem it cannot be easily fixed and may just balance itself out if you just LITFA.

Do you recommend testing soil pH? Seeing the high pH runoff seemed like a reasonable explanation for my apparent nute lockout/hungry plants. I’ve been researching since posting, and I’ve certainly seen not to aggressively “chase” runoff numbers, but then how do I “fix” my clearly-not-thriving plants? I’ve been very consistent with pHing every drop that goes in at 6.3-6.5.

 

[Mañ'O'Green]

Do you recommend testing soil pH? Seeing the high pH runoff seemed like a reasonable explanation for my apparent nute lockout/hungry plants. I’ve been researching since posting, and I’ve certainly seen not to aggressively “chase” runoff numbers, but then how do I “fix” my clearly-not-thriving plants? I’ve been very consistent with pHing every drop that goes in at 6.3-6.5.

That is all you can really do at this point. Without lab equipment there is no way to know what is in the pot. You may read run-off at 600 PPM but what is the make-up of that PPM 500 Nitrogen 50 Phosphorus 50 Potassium, or 50 Nitrogen 400 Phosphorus 150 Potassium?????????????????

A good tool to read the PH in the root zone is a Accurate 8 Soil probe. It is a good tool and can be useful. Do not buy cheap ones as the do not work and of course there are better ones that cost more. I do not think your problem has anything to do with PH. Soil normally runs 6.4 to 7 PH. Your lock-out is from too much of something.

Just plain water. If they do not pull out of it in a week dump that soil and get something made for cannabis.