Register ICMag Forum Menu Features Mark Forums Read
You are viewing our:
in:
Forums > Grow It! > Growers Forums > PH chart comparing soil PH to Soilless/hydro

Thread Title Search    
Click to Upgrade your account
Post Reply
 PH chart comparing soil PH to Soilless/hydro Thread Tools Display Modes
Old 08-17-2006, 03:55 AM   #1
meduser180056
Member
 
Join Date: Aug 2005
Posts: 962
meduser180056 has a spectacular aura aboutmeduser180056 has a spectacular aura aboutmeduser180056 has a spectacular aura about
PH chart comparing soil PH to Soilless/hydro

Check out this chart I came across over at another site.

What do all you Icer's think?

According to this chart optimum Ph for soilless is around 5.2-5.5. I always thought it was higher.

Cool chart. Crazy the difference between soil PH and soilless.





meduser180056 jest offline   Quote


Old 08-17-2006, 10:50 AM   #2
sproutco
Banned
 
sproutco's Avatar
 
Join Date: May 2006
Posts: 2,644
sproutco is just really nicesproutco is just really nicesproutco is just really nicesproutco is just really nicesproutco is just really nice
That chart/table is bs. Best ph range for soilless mix is 5.6 to 6.2 Below 5.6, micronutrients get too available especially manganese. They can become toxic. Hydro ph is about the same as soilless. Here is a chart that shows hydro (use the same ph's for soilless) and outdoor mineral soil (really a little high recommended). Click on it to enlarge.


Last edited by sproutco; 08-17-2006 at 10:56 AM..
sproutco jest offline   Quote


Old 08-17-2006, 11:06 AM   #3
mace_ecam
Member
 
Join Date: Feb 2006
Posts: 716
mace_ecam will become famous soon enough
here is a bunch of pH charts, the ones you guys posted are also there:
http://www.angelfire.com/cantina/fou...ailability.htm

please keep two things in mind:
- these charts only describe the solubility of certain nutes at a certain pH range, not if they are really taken up
- pH (and EC also) matters in the rootzone, not in the res (unless its NFT/DWC), measure your runoff! Otherwise you still don't know the pH in the rootzone, and thats what matters.

mace

Ps: beware of "information" that uses the term marijuana instead of cannabis
mace_ecam jest offline   Quote


Old 08-17-2006, 02:04 PM   #4
treble
Member
 
Join Date: Feb 2006
Posts: 566
treble has a spectacular aura abouttreble has a spectacular aura about
thats interesting in that most of the charts showed the same ph for the soil at about 6.5 being dialled in and hydro for the most part about the same.... the only chart showing significantly different trend to this is the color one... I think I have seen that one around before but cant say I noticed the hydro ph that low.

I dont go much below 6.5 and I doubt I could hold it at 5.8 - 6.0 in my res... I dont know but if its correct I will be prepared to try... need to see what the concensus is and look around some more

interesting info .. thanks .. lets see if there is some more
treb
__________________
my questions are all hypothetical and should be viewed in a past tense.

AK48, White Rhino grow with some Boggle to come <- pics getting better as we go

Hi ho Hi ho..... its bogglegum we'll grow <- the bogglegums on the grow

infowars.com Because there's a war on for your mind
treble jest offline   Quote


Old 08-17-2006, 08:28 PM   #5
Blackmelo
and his mighty gerbil ↓
 
Blackmelo's Avatar
 
Join Date: Feb 2006
Posts: 434
Blackmelo will become famous soon enough
sproutco, I'm starting to get sick of your constant arguing.
You just seem to want to argue for the sake of it don't you?

Your comments are bs and we have had enough hearing you trying to disagree just to get some attention.

Try saying something positive for once in your life.
__________________
I taught some1 to grow weed. Thought I was doing him a favour. Turns out he just used me to learn from the pro and then reported me to the police.
Don't know what hurt more, beeing betrayed in such a horrible way or the cops knicking all my stuff

Now an ex-grower here to give advice.
Blackmelo jest offline   Quote


Old 08-17-2006, 08:33 PM   #6
sproutco
Banned
 
sproutco's Avatar
 
Join Date: May 2006
Posts: 2,644
sproutco is just really nicesproutco is just really nicesproutco is just really nicesproutco is just really nicesproutco is just really nice
Quote:
Originally Posted by treble
I dont go much below 6.5 and I doubt I could hold it at 5.8 - 6.0 in my res... I dont know but if its correct I will be prepared to try... need to see what the concensus is and look around some more
Hydro in general is 6 to 6.5 with the only plant I know liking lower is lettuce at 5.8 I got this from Hydroponics: a practical guide for the soilless grower by Benton Jones at the Univ. of Ga. I asked Howard Resh, an internationally recognized hydro grower, and he said 6 to 6.5 with the lettuce exclusion too. I like 6 ph for hydro.

Soilless 5.6-6.2 I got this from David Reed at Texas Tech in Water, media, and nutrition for greenhouse crops (ball publishing)

Outdoors in the ground 5.8-6.5 I got this from Clemson Univ.

I need a better chart than the one I presented. I am not really sure about hydro because it has been 15 years since I did it at a university. I don't remember adjusting ph.

Problems really start to happen growing below 5 and above 7.

Last edited by sproutco; 08-17-2006 at 08:56 PM.. Reason: added some references for my opinions
sproutco jest offline   Quote


Old 08-17-2006, 08:43 PM   #7
CalcioErba2004
ICmag Football Nut

 
CalcioErba2004's Avatar
 
Join Date: Sep 2004
Posts: 2,770
CalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivorCalcioErba2004 is a survivor
Ph in hydro should be between 5.0-6.0 Soilless you can drift a little higher, me personally I wouldnt go past 6.5. Run off water in soil shouldnt read lower than 6 or higher than 7.
__________________
Genesis 1:29-Then God said, "I give you every seed-bearing plant on the face of the whole earth and every tree that has fruit with seed in it. They will be yours for food."
Genesis 9:3-Everything that lives and moves will be food for you. Just as I gave you the green plants, I now give you everything.
CalcioErba2004 jest offline   Quote


Old 08-18-2006, 12:54 AM   #8
meduser180056
Member
 
Join Date: Aug 2005
Posts: 962
meduser180056 has a spectacular aura aboutmeduser180056 has a spectacular aura aboutmeduser180056 has a spectacular aura about
Here's where the chart came from.

http://aggie-horticulture.tamu.edu/G...ghhdbk/ph.html

I'm thinking 5.8 for soilless since it's inbetween what Sproutco and Varaan are recomending. Over 6 sounds too high, but under 5.6 seems low.

I'll just go with that. LOL Not very scientific, but seems like a good approximation.
meduser180056 jest offline   Quote


Old 08-18-2006, 01:13 AM   #9
sproutco
Banned
 
sproutco's Avatar
 
Join Date: May 2006
Posts: 2,644
sproutco is just really nicesproutco is just really nicesproutco is just really nicesproutco is just really nicesproutco is just really nice
Your exactly right with that ph in soilless. Seems your ph chart may be old thinking or something. Like I said, the newest book about soilless growing from David Reed also at Texas Tech(like your chart) lists what your aiming for.
Here is an article by ohio state that also says 5.5-6.3 http://ohioline.osu.edu/hyg-fact/1000/1252.html

Last edited by sproutco; 08-18-2006 at 01:19 AM..
sproutco jest offline   Quote


Old 08-18-2006, 02:59 AM   #10
meduser180056
Member
 
Join Date: Aug 2005
Posts: 962
meduser180056 has a spectacular aura aboutmeduser180056 has a spectacular aura aboutmeduser180056 has a spectacular aura about
Cool sounds like I'm golden then.

Since PH is so critical and most of us take it pretty seriously let me just put a lil reminder out there.

CALIBRATE YOUR PH METER! Do yourself a favor and check it at least once a month.

I hadn't checked mine in months and when I went to calibrate it was .5 off. Sux

This is even more important if your hydro.
meduser180056 jest offline   Quote


Post Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +2. The time now is 01:17 AM.


Click for great deals at Seedbay

This site is for educational and entertainment purposes only.
You must be of legal age to view ICmag and participate here.
All postings are the responsibility of their authors.
Powered by: vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.