Major PH Problems - Tried all the usual stuff with no success... PLEASE HELP!

Hi guys,

Long time creeper, first time grower and poster. Always been interested in growing but never worked up the balls until recently. Now, I dont think I ever want to go back. Just cant wait to start saving all that cash I would otherwise spend on my medication throughout the year.

Set up Info:

1 - 4x4x7 grow tent

1 - 324w - 6 bulb T5HO 4000K fixture with bulbs

1 - 240w - Lighthouse Blackstar - LED

1 - Vortex 4", 175cfm with carbon filter

Flora Series nutrients and Miracle grow mositure control soil medium (yes, I know.... I've learned my lesson on that one! :P).

Light Schedule: 24h / Temp Range: 72 - 82F / RH Range: 20-40%

Past Feeding Schedule: Fed a 1/16 dose of Miracle Grow tomato fertilizer (high nitrogen fertilizer). at 2 weeks, fed 1/2 does of Flora three part series (week 2) at week 4. nothing else has been fed to it other than some SuperThrive to assist in stress reduction for the plants as this is my first grow and am learning as I go.

Strain: Blueberry Cough by Jordan of the Islands

EDIT: These plants were all grown from seed and broke ground on April 5th, 2013. How do they look in your opinions for being a month old from seed? Am I on the right track? or are my plants growth stumped compared to what they should be at?

I think that is about it for the set up. If I left anything out, please ask and I will provide.




The problem:

I have tried everything from flushing with neutral water, to flushing with 7.5-8 water, to adding a little bit of hydrogenated lime to the soil and or water (didn`t have any dolomite and I read that HL works quicker than dolomite) and I havent been able to get the run off to measure anything more than a 5.5 (on a good day!). typically, it is around the 5 mark (occasionally dips below to 4.8-4.9).

What is confusing me is that generally, my plants look great. I mean, I am a first time grower, so technically, as far as I know they could look two minutes away from death as far as I know, but they appear to be healthy. They have shown signs of lacking various nutrients which I have tried to correct by trying to fix the ph levels and despite not fixing the ph levels in the soil, these nutrient problems do not seem to be getting worse. Is the transition period when the soil is waterlogged with ph7.5 water and slowly settling to the soils natural acidity level allow enough time for the plants to pull up the nutrients they need at this stage in the game?!? Im stumped.

I water once to twice a week depending. I started on a watering schedule (Sunday morning and Wednesday) but learned real quick the error in that logic.

I am trying to get a hold on this ph issue before going into flowering (which I am hopeful will be on May 19th).

Any advice on what you guys have had success with in your grows would be greatly appreciated.

Ive attached a few pics of my grow as I know how much you guys love the pics! (As do I!
)​
 

SeeRockCity

Active Member
dude, SuperThrive suuuuuuucks....(just my personal opinion... I used one drop in one gallon ONE time and it killed all of my otherwise healthy plants)

if you have a Ph tester... do you have some Ph Up?
I would start the MG feed again (although personally not a fan) and adjust your Ph to just above the median to 6.8
That way you are still in range AND you are raising your soil Ph a bit

get some dolomite though...probably help a whole lot!
 
Hi SeeRock

Thanks for your response. I appreciate you taking the time.


I do have a PH tester. Initially, I started off with the strips, but realized very quickly how inaccurate they were and bought a Milwaukee PH600 meter with calibration solution. I do also have PH up and PH down solutions.


Initially, when I first noticed the low PH level (at first it was about 4.6-4.8) I started PH testing my water before watering and made sure it was neutral. Over the course a two weeks, did two full flushes with neutral water. Results of run off were a little higher (at roughly 5.0 - 5.2ish) but not anything significant. I was hoping that the PH would increase slowly over the few weeks, but alas, despite increased efforts (i.e. doing flushes with water over a PH of 7, adding lime to soil, I’ve stop fertilizing so as to stop build up in the soil until I get the pH under control...). I then tried to a flush with water that has been pH’d to 7.5 with no additional success. The run off was still in the same 5.0-5.2 range.


Dolomite and Hydrogenated lime are still lime and should work just as well. The only main difference that I’ve been able to find is that dolomite works over the course of your entire grow, slowly adjusting it over months. I needed an immediate fix and I have some hydrogenated lime in my usual gardening supplies, so I used that. Hydrogenated lime, from what I read, is supposed to be a much faster acting ph adjuster. That is just how I understand it from a noobs perspective. Feel free to correct me if my interpretation is wrong or misguided.


Another friend advised me to stop feeding the plants water that has been ph adjusted to above 7, so I’ve stop doing that. My initial hope was that it would help force the soil into a higher PH range, which did not seem to work out the way I was hoping. In fact, it wasn’t done anything!


Just to clarify here, my problem isn’t not knowing what a good ph level is. my problem is not being able to get my plant’s soil within this recommended range, despite all attempts to do so.


I just don’t know what else to try. Maybe Im not putting enough lime in the soil. Im obviously worried about over compensating, so it is possible I am not putting in enough. I out in about a tbsp per container at the top of the soil. Worked it in a bit, then watered with PH neutral water.


Plants are in 3 gal pots.
 

SeeRockCity

Active Member
if it were me...I would keep on with the same feeding of lime... less is more...you're at the right strength
but I would also check the Ph of my feed before administering... instead of feeding at 6.5... try adjusting to 6.8 or even 7.0
this will help bring the soil Ph up a little until the lime kicks in...

you will definitely have deficiencies if your Ph stays that low....
it may take a little time and work to raise the Ph... as these will work slowly...
but if you stay pointed in the right direction, eventually you'll get there...
a week or so of feeding higher Ph water accompanied by the lime should do you just fine.

Disclaimer: I'm no expert either... only been growing indoor for 2 years....
 

redeye jedi88

Active Member
how much water did you use when you flushed? your plants look healthy i wouldnt be trying to fix a problem thats not there if your plants are healthy why change what your doing
 
Hi RedEye

Thanks for joining in.

Im glad someone thinks the plants look healthy. I wasn't sure if they did or not cause this is my first grow. What initially brought to light the ph issue was that the plants were showing very minor signs of deficiencies (Cag/Mg - brown spots on leaves and phos - that multicoloured "oily" look on leaves, that I could determine (keep in mind, I dont know what Im doing). So after testing and noting the pH levels were less than 5, I started trying to rectify the problems.

When I flush, I use about 9 gals of water.

The biggest thing that is confusing me is the fact that with the flushing I have been doing, despite not being able to permanently change the ph to a level of 6 or above, the plants seem to generally be getting the nutrients (more of less) that they need at their present state of development.

I have no problems stopping what I am doing. but I wouldbe worried that if I do, the plants will revert back to their previous conditions and start showing signs again. I am assuming that my watering with a high er than eutral pH allows for a time window where the PH is just right to allow the plant to suck up some nutrients.

Thats the only logical explanation I can think of...

LOL, stumped :P

No one has encountered this issue before? being unable to raise ph levels of soil?
 
I guess I worry that even though presently they are getting enough nutrients, once I switch to flower, if the pH levels are not fixed, I worry that my baby girls will starve for nutrients and Ill lose them and the time Ive spent nurturing them :P
 

redeye jedi88

Active Member
believe it or not i had the same problem with an auto i have atm i flushed it with a little more than 3x the pot size and it had 0.5ml per litre of cal/mag in it now this didnt fix my problem straight away i had to wait for soil to dry out again and repeat the process 2 more times, your problem might not be ph it might just want some cal/mag if you dont have any i would buy some and on your next grow buy some dolomite lime put it in your soil before you grow and forget ph good luck
 
Hmmm, I wonder if that may be why Im not obtaining the results I am looking for. I dont think I have been letting my soil completely dry out before re-watering. That is something I have just started doing after realizing that allowing the soil to completely dry right out is actually good for the plants roots. I'll be sure to let it completely dry out before doing another flush. Today is supposed to be a watering day (I skipped Sunday because they weren't dry enough). I guess Ill just have to buy some cal.mag then :P

I thought it wouldn't be needed cause hydrogenated lime is calcium hydroxide. So i figured the plants could obtain its cal/mag from that. maybe not though. :P

Still have a lot of learning to do, apparently :P
 

redeye jedi88

Active Member
i feel the soil through the drainage holes to see if its dry, i have dolomite lime in my soil and i use 0.5ml of cal/mag per litre in my water cal/mag is good because it has calcium and magnesium that lime your using isnt good, your first grow you will learn a lot
 

rwbrock

Active Member
did you just double post this? I just replied to your other thread....next time no miracle grow or any soil that is slow release 6 months of food in it. Be careful feeding with that soil...
 
did you just double post this? I just replied to your other thread....next time no miracle grow or any soil that is slow release 6 months of food in it. Be careful feeding with that soil...
Hi RWBrock

Thanks for your reply to both postings.

Yes, I did initially post this in another part of the website. But after reading through a few other threads I realized that I should have posted that in the noob section so I tried to move it over here. When I couldn't figure out how to do that, I simply created a new thread in the proper section of this forum.

Advice definitely take whole heartly! I will buy either fom fox farms soil or medium-less soil next time!

And Im going to the store to pick up some cal/mag right after work today :)

Thanks again guys for al the advice!

Do you give people props or something on this website for helping inthe forums sections or is that not something done on Rollitip.org?
 
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