[geneva_sativa]

Thanks, RB56. . .heh heh

Guess that would explain the magic numbers !

[calisun]

Originally Posted by slownickel

I would suggest a light phosphorus feed, say 0.5% phosphoric acid. Do it light on one side of a plant, on one branch. That is how you learn.

I have a old bottle of advancing nutrients ph down. The label is worn out but I think it is pure pharmaceutical grade phosphoric acid. My concern is it is so strong, with about 1/4 oz will drop the ph of a 50 gallon barrel about a point.I Would need to then ph up my soluition before use. Is there a better source of phosphoric acid? Thanks

[Michael49]

Originally Posted by calisun

I have a old bottle of advancing nutrients ph down. The label is worn out but I think it is pure pharmaceutical grade phosphoric acid. My concern is it is so strong, with about 1/4 oz will drop the ph of a 50 gallon barrel about a point.I Would need to then ph up my soluition before use. Is there a better source of phosphoric acid? Thanks

I thought of this myself (it's the only source of phosphoric acid I have) but i've no idea how to dilute it appropriately to use for foliar feeding.

[Michael49]

I ran my exhaust fan during lights out for the first time last night. It didn't raise my temp at all (59 degrees low) but it did drop the lights out humidity to 35% from about 70%.

[slownickel]

Take what ever phosphoric acid you have, measure 0.5% of it into water. Spray. Don't pH it as it will either burn the sensor or freak you out, hahaha.

Try one leaf so as not to take any risk. Never do anything without trying it in a small way.

(5 ml in 1000 ml of water) oh you guys are freaking, I can feel it. No ph down either. The pH will be close to 2.5 or so. Please stop freaking! Easy's fault. My last bit of diamonds.... rrrrrr

https://www.icmag.com/ic/showthread....31317&page=348

This is the page where we have been through the phosphoric acid foliar issue at this same dose before, for those that don't know this thread. I imagine you could go to at least 2% in veg, but I HAVE ONLY ever applied 0.5% in this crop. Jidoka applied even more after his first experiment, hahaha but I can't get him to say how much, it did go to 0.5 pH though. Must have been a bunch!

[Cannabologist]

[quote=Michael49;8160750]Thanks for your input, the new growth always seems to look good, but then the mature fan leaves start keep dying :(. [quote]

You are suffering a host of deficiencies likely caused by nutrient lockout....

Yellowing from bottom up, leaf veins reddening from the petiole, is nitrogen, which comes along with calcium, which is rust spots on veins, and magnesium, also yellowing, but also curling up of the leaf margins, and mg alone you will see no red pigmentation of the major leaf vein.
Potassium leaf tips curl down, and will brown/grey, die.

Iron starts at the top of a plant as yellowing. It is quite uncommon but mistaken for N deficiency.

Nute burn your tips turn yellow, brown, and curl up.

dot dot dot.

You have all of this pretty much. lol

https://www.icmag.com/ic/showthread.php?t=336296

This is your key. To deficiencies that is. Follow that key..


3 gallons in fab pots for 6 weeks is too long FFOF lasts prob 3 weeks from a transplant. Idk about that roots nute, I would stop ph'ing it firstly. Sounds cray, but that's what I'd first do if I didn't first first toss it and get something else.
Secondly youre overfeeding and prob overwatering. Feed once maybe 2 times a week. Their schedule calls for 5 mls per gal I'd go with that. But right now don't feed anything let it dry out and just water. Don't go nuts just water it when it needs it. Humic, fulvic acids, kelp, and amino acids can help get things going again. Give it like 3 or 4 days to work itself out see where things are at then maybe on the next watering you can give it 5 mls again but I'd go with different nutes like, gh's 1 part nova or cocotek, something easy cheap and works. Not that aurora doesn't but you're obv doing something wrong sorry to say. A product like optic foliar spray on those leaves would help revitalize the plant. Other products like revive as well.
Id also throw it all away and start again lol. But don't take my opinion.

[hyposomniac]

Originally Posted by slownickel

Take what ever phosphoric acid you have, measure 0.5% of it into water. Spray. Don't pH it as it will either burn the sensor or freak you out, hahaha.

Try one leaf so as not to take any risk. Never do anything without trying it in a small way.

(5 ml in 1000 ml of water) oh you guys are freaking, I can feel it. No ph down either. The pH will be close to 2.5 or so. Please stop freaking! Easy's fault. My last bit of diamonds.... rrrrrr

https://www.icmag.com/ic/showthread....31317&page=348

This is the page where we have been through the phosphoric acid foliar issue at this same dose before, for those that don't know this thread. I imagine you could go to at least 2% in veg, but I have only ever gone this far in this crop. Jidoka applied even more after his first experiment, hahaha

I like the new sig, it's a favorite of mine.
The first time I saw you recommend this spray, I thought you were pranking Jidoka.
I have since done it and can confirm that this won't dissolve your plants into a pile of goo

[slownickel]

Originally Posted by hyposomniac

I like the new sig, it's a favorite of mine.
The first time I saw you recommend this spray, I thought you were pranking Jidoka.
I have since done it and can confirm that this won't dissolve your plants into a pile of goo

Great! No goo is good.

Any positive response?

[hyposomniac]

Originally Posted by slownickel

Great! No goo is good.

Any positive response?

Yes.. positive response.
after my scary soil test w the really high iron...and then replanting into fresh mix, while the roots rebuilt., P sprays, alternated with Ca/mn/zn/b spray and the plants really recovered, even while the rootzone was suffering ptsd.
They got frazzled pretty good by that iron overload, but I do believe we will have a decent harvest.
Working on a thread soon for the new soil build.
PS I think I figured out how all that iron and nitrate got into the mix.. it was a bag of blood meal that leached into my other shit.

[Michael49]

[quote=Cannabologist;8161898][quote=Michael49;8160750]Thanks for your input, the new growth always seems to look good, but then the mature fan leaves start keep dying :(.

You are suffering a host of deficiencies likely caused by nutrient lockout........

.....3 gallons in fab pots for 6 weeks is too long FFOF lasts prob 3 weeks from a transplant. Idk about that roots nute, I would stop ph'ing it firstly. Sounds cray, but that's what I'd first do if I didn't first first toss it and get something else.
Secondly youre overfeeding and prob overwatering. Feed once maybe 2 times a week. Their schedule calls for 5 mls per gal I'd go with that. But right now don't feed anything let it dry out and just water. Don't go nuts just water it when it needs it. Humic, fulvic acids, kelp, and amino acids can help get things going again. Give it like 3 or 4 days to work itself out see where things are at then maybe on the next watering you can give it 5 mls again but I'd go with different nutes like, gh's 1 part nova or cocotek, something easy cheap and works. Not that aurora doesn't but you're obv doing something wrong sorry to say. A product like optic foliar spray on those leaves would help revitalize the plant. Other products like revive as well.
Id also throw it all away and start again lol. But don't take my opinion.

Thanks for the input.

Its difficult for me to believe I'm overwatering - at this point I'm watering about every 4-6 days.

And I don't think I'm overfeeding as I'm typically only feeding once/week at most.

Why should I stop pH'ing my water?

I might try the Optic foliar spray.