phosphorous and potassium

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rabbit229

Active Member
need a little help so i thought i would pic the brains of you professionals, i have been doing many searches online and still cant find the answer.

my Q is what is the ideal p.h level for plant to absorb phosphorous and potassium (pk13/14) . using N.F.T system

would be very grateful for an answer
 
R

rabbit229

Active Member
thats all i been reading
but i know plants take in diffrent nutes at diffrent p.h levels. i once saw a chart, and sure they absorbs best at 5.5

can some one please elaborate
 
YThor

YThor

Well-Known Member
This table may help.

View attachment 1385213

Note that while some are more available at slightly higher pH, rainwater is typically around pH 5.6. Although it has no dissolved solids in it, rainwater is not pH 7.0 because it has a tiny amount of carbon dioxide dissolved in it, forming carbonic acid.
 
woodsmaneh!

woodsmaneh!

Well-Known Member
For maximum absorbtion your pH should be at 7.0, neutral pH is where the magic happens, so if you ran your pH at any thing less than7.0, lets say 5.5 you are wasting 32.69% of your fertilizer, at 6.0 you are wasting 19.67%.

Note Potassium is 100% uptake from 6.0 to 7.0, Phos drops to 52% at 6.0
 
R

rabbit229

Active Member
now thats really confused me!!!!! i been reading that its really un healthy to run p.h at 7.0 and keep it at 5.7 for n.f.t

so now i am thinking it a really good thing to run it up at 7.0 in the last few weeks. would this be right? confused.com
 
woodsmaneh!

woodsmaneh!

Well-Known Member
I don't know about NFT, maybe look into it more before you change. I don't want to screw your grow up, I grow in dirt so am not a NFT expert. IMHO uptake of elements is the same, but I could be wrong.
 
Uncle Ben

Uncle Ben

Well-Known Member
Recommend you take your question to a university like Clements or Texas Agrilife. Next choice would be a tech at Dyna-Gro Corp.

For the record, my rainwater pH is neutral.

UB
 
woodsmaneh!

woodsmaneh!

Well-Known Member
Spent most of last night reading on NFT and it looks like most people have it a 5.8 to 6.6, could not find a definitive number.
 
T

tatamama

New Member
I read a botanist/scientests words and max uptake in hydro/nft, my system too, is 5.2, and bye the way rain water that I have tested is 7+. Wow the info on here can be so off. 5.8 is a standard that allows most things to work best together but 5.5 is a good shoot for when uptake in flower of K and P are your goal. I let mine bounce a bit but not swing. Up to 5.8 to down around 5.3......


rabbit229 said:
now thats really confused me!!!!! i been reading that its really un healthy to run p.h at 7.0 and keep it at 5.7 for n.f.t

so now i am thinking it a really good thing to run it up at 7.0 in the last few weeks. would this be right? confused.com
Click to expand...
 
potroast

potroast

Uses the Rollitup profile
I've been growing in hydro since the '70's. I keep my res at 5.8 pH, and let it rebound to 6.2 and then adjust back to 5.8.

That's the best range for hydro nutrient availability, for soil you want it 6.5 pH.

:mrgreen:
 
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tatamama

New Member
Well 5.8 is where you should shoot for but as I have read about this many times and one very well regarded botanist said it. So do as you please but I get huge results from my grow and I keep the ph most of the time like to day, at 5.5. Max uptake of K is 5.2. Go do some research. 5.4 is also in much literature stating it is a good hydro flowering ph. Like I said I split hairs and mine has worked out every time very well.. 6.2 or a bit higher for veg/clone. Over 6 is just not where you want to be in hydro in flower and if you can read you will see it all over every site on the web except from idiots that post shit they know nothing about.. 6.2 is quite high for a water no soil plant enviornment end of story.. Look up Max uptake of K in hydro botany.. Then come back and tell me what you read. Or qoute one respectable source that says 6.2 in flower/hydro is where you want to be.. WOW!!!!




potroast said:
I've been growing in hydro since the '70's. I keep my res at 5.8 pH, and let it rebound to 6.2 and then adjust back to 5.8.

That's the best range for hydro nutrient availability, for soil you want it 6.5 pH.

:mrgreen:
Click to expand...
 
potroast

potroast

Uses the Rollitup profile
Did you even look at the charts in posts 4 and 9???

With your months of experience to go by, I'm sure that other members will choose whom to believe. :lol:

Party On, Wayne! :bigjoint:

:mrgreen:
 
woodsmaneh!

woodsmaneh!

Well-Known Member
potroast said:
I've been growing in hydro since the '70's. I keep my res at 5.8 pH, and let it rebound to 6.2 and then adjust back to 5.8.

That's the best range for hydro nutrient availability, for soil you want it 6.5 pH.

:mrgreen:
Click to expand...

OK this is where I disagree with you, living dirt 7.0, for max uptake of all elements. Full stop. Got proof show me. But this is about hydro.......
 
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