PH down= phosphorus toxicity?

[thebeachman]

Im trying to figure out a leaf curl problem and talking to my guy at the
hydro store we were going over some possibilities and he mentioned
something about adding phosphoric acid may lead to too much
phosphorus in the solution anyboby hear of this?:hippy:

thebeachman Reviewed by thebeachman on 08-11-2009. PH down= phosphorus toxicity? Im trying to figure out a leaf curl problem and talking to my guy at the hydro store we were going over some possibilities and he mentioned something about adding phosphoric acid may lead to too much phosphorus in the solution anyboby hear of this?:hippy: Rating: 5

[Rusty Trichome]

I've been using phDown (phosphoric acid) for a few years, and have never had a problem. Well, except for a few months ago when I mixed 5 gallons worth in a gallon jug. Kinda pissed-off the ladies, but a quick flush and all was good.

Anyway, I have 7.9 to 8.0 ph wellwater and use 1/4 tsp:gallon, bringing my ph down to around 6.7-6.8.

A former troubleshooter in here (stinkyattic) did the math for me a couple of years ago, and at my dilution rate she thought I was fine. She's a chemist familiar with such chemo-numerical mumbo-jumbo.

The thread is around here somewhere...AH HAA...here it is, but don't let the title fool ya:
Humic Acid...

[phatsesh101]

rusty is prety much correct

but for shits and giglles what brand are you using, some organic ph adjusters are different, i used one that needs an assload more than my gen hydro

[thebeachman]

Mad farmer, I Iguess through the course of a weeks worth of topoffs
I may be using a total of 1 tsp per week and when I topoff I dont add nutes
so I thought the idea was certainly plausable but I know im not using a whole lot of phosphorus to begin with.Thanks guys for the reassurance.:hippy:

[Rusty Trichome]

but for shits and giglles what brand are you using...?

General Hydroponics here, too.

[thebeachman]

Ive used this for three years but I have had this mysterious
leaf curl problem about every other crop and I have yet to
defininatively rule out any cause.

[Rusty Trichome]

Are you watering deep enough to provide moisture to the lower root zone?
Does you medium absorb and hold the moisture, or does it flow right through?

Are the leaves dark or light green? Are the leaves paper thin, or hearty?

What are day/night ambient temps, (room temperature, not under the lights) and what's the room's humidity?

Phosphoric acid is water soluble, and will easily flow-out with the runoff. Doubtful it's the cause. Were you giving too much phosphorus, the ph would crash before any indicators of build-up would occur.

After this I think filling-out the troubleshooting form would be appropriate, along with any pictures you can provide.

[phatsesh101]

mad farmer? new to me, but they do say they use different acids to control phosphorus lockout. never experianced it personally and i use a nice amount of ph down with water reaching 7.8-8 after sitting out over night.

sounds like a ph prob, u should fill out rustys form

i usually curl down when my ph is a lil hi like 6.9 -7 from 6.5 oh yeah disclaimer (this is not a diagnosis)

[Rusty Trichome]

It also has a lot to do with the source, IMHO.
I guess if you were to add a few cups of bone meal and bat guano to a gallon of soil and adjust your water down with H3PO4, (Orthophosphoric Acid) and use rose food, (10-52-10 N-P-K) you'd experience phosphorous-caused lockout. (among other problems) :thumbsup:

The only acid I really wouldn't get to lower ph is the nitric acid. Not too sure it would work well with flowering.

[thebeachman]

I filled out the form in my thread here on Aurora Indica Curled leaves
as I am nervously nursing one sick plant after another with this strain.I would appreciate your input if you would check it out.Rusty Ive had a conversation
with you a while back on split ends on my pistils ,well it turns out that plant is rocknrollin and the normal looking plant is the one going south now.
Oh by the way I use DWC .All plants are sharing the same solution but only one affected.