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Old 06-28-2010, 08:09 PM #1
joe fresh
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Ph for promix

i was just wondering, i have always used promix and mixed in compost, and watered at 6.5 and everything was ok.



this time i decided to use just pure promix, and was watering at 6.5ph, but im noticing some def's. some ppl were telling me to water at 5.8 because its a soiless mix.



so my quetion is...what is the real water ph you should be using when using promix?
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Old 06-28-2010, 08:19 PM #2
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Promix tends be a little on the low side both micro-nutrient and pH wise in my experience. If the only difference between your mix is the lack of compost that's most likely what's at fault here. Regardless of all the soil mixes on here, if your old mix was doing great, go back to it. It sounds simple as you can get. Don't mess with what works.

I personally add compost, dolomite, perlite and a handful of whatever else I have around that looks fun to my promix, but really it's mostly promix & compost. It works great, the plants love it, and I have few if any nutrient problems with it.
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Old 06-28-2010, 08:20 PM #3
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I've been using the stuff for a very long time (with only perlite added) and always keep the ph right around 6.0 with great results. Promix is a very forgiving medium ph-wise, keep it right around 6ish and you will be fine I promise.
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Old 06-28-2010, 08:33 PM #4
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thx for the quick response guys.


well heres the problem with adding compost and dolomitic lime, my grow is much bigger than it used to be. i have 160 7gal pots to fill. and i dont have much room to mix the compost and promix together.

last run i used the compost and dolomitic lime, but added too much lime and raised the ph of the soil too high, so i had ph problems through out my grow.

so i thaught that if this time i used only promix i would skip right over that problem.

but once again i have problems...
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Old 06-28-2010, 09:03 PM #5
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Problems watering so many plants?

Those are big numbers man, in 7 gal's too? Nice.
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Old 06-28-2010, 09:15 PM #6
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I've been using the stuff for a very long time (with only perlite added) and always keep the ph right around 6.0 with great results. Promix is a very forgiving medium ph-wise, keep it right around 6ish and you will be fine I promise.
I transplanted all my small plants into 5 gallon pots using ProMix. I just dialed it in at 6.0 and they are very happy..
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Old 06-28-2010, 11:02 PM #7
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With a grow of that size adding anything besides maybe perlite seems like a chore. These days I mess with coco and what not, but straight promix is by far the easiest medium I've ever used.

Good base nute + pH 6.0 =
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Old 06-28-2010, 11:10 PM #8
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yeah i think i just figured out my problem, now to figure out how it got like that and how to fix it.....


heres what is going on ...just did a runoff test


PH---- going in 6.1---------comming out 4.7


ppm----going in 150(tap water)-----comming out 2000+ppm (meter dont go any higher)


this test was done on the worst looking plant, the one i posted below.


so if you could tell me whats going on to make this happen.....and how should i go about correcting the situation?




ps...for the runoff i made sure to collect atleast 1 Gal of runoff before i tested it
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Old 06-28-2010, 11:11 PM #9
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here they are....
Attached Images
File Type: jpg problems 001.JPG (271.4 KB, 115 views)
File Type: jpg problems 002.JPG (273.8 KB, 85 views)
File Type: jpg problems 004.JPG (244.0 KB, 115 views)
File Type: jpg problems 006.JPG (217.2 KB, 65 views)
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Salt Tolerance of Plants in Soil

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Old 06-28-2010, 11:23 PM #10
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Definitely overfed, you are probably just giving them a bit much food. What nutes are you using and EC/ppm are you feeding at?

If they are burning bad quickly I'd go ahead and flush em if at all possible, don't expect it to be fun though. A couple of gallons of florakleen will help you bigtime. Plain water for a while with decent runoff at the very least if there are just too many. That's a lot of plants.
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