High ph won't move

[bobwobbly]

Hi everyone,

Soil Grows - Peat Based

What is your experience level? (first timer, novice, experienced...)
First Timer

Your Equipment:
.1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's)
LED Grow Northern MS0006

.2) Distance from tops?
2'


.4) Is there a consistent fresh air supply?
Passive intake with circulation fan

.5) Do you have an exhaust fan and a circulation fan?
Exhaust 80m/h and a desk fan for circulation
.6) What are the bulb wattages, kelvin ratings, and schedule?
240w on 18/6

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...)
Celtic Gold probiotic compost 75% Perlite 25% Dolomite lime 2tbls

.8) Size of container.
10l Airpot


Your nutrients and water:
.9) Source of water. (tap or filtered) What's it's ph?
Tap water left for 48hrs, ph 8.0

10) Method of checking water ph. (ph pen, test strips, aquarium test kit...)
ph pen calibrated and tested
11) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)
Apple cider vinegar

12) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.
Biobizz - Root juice, Grow, Bloom and Top Max
13) How often are you watering between feedings, and how much per watering?
1l every 3-4 days
14) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)
Calmag and foliar fed epsom salts

15) Are your ph levels stable, or do they fluctuate?
Stable
16) What is your ingoing water's ph? ...your runoff ph?
Ingoing - 3 waterings, 6.5, 6.2, 5.8... Run off always 7.1-7.2
17) Do you foliar feed? If so, with what, how often, and at what time do you spray?
Foilar fed twice with epsom salts 2tsp/l

Your growroom:
18) Indoors or outdoors?
Indoors

19) What size of closet, room or hut?
60x90x160

20) What are the temps and humidity levels while lights are on? ...With lights off?
Lights on 35% - 50% Lights off up to 72%

21) Have you seen signs of insects in the growroom?
None

Your strain:
22) What strain are you growing? (Indica dominate or Sativa dom?)
DP AutoMazar

23) Is this an photoperiod strain?
Auto

24) How old is the plant?
20 Days

25) In what life-cycle is it? Vegetative, pre-flowering, flowering, rippening?
Veg

26) From seeds or clones?
Seed

Tried everything I can think of to get the ph down, even flushed yesterday with 30l plain ph'ed water, 6.3, and run off ph is still 7.2.
Plant has chlorosis on all leaves but still seems to be growing.
Stuck now...any help would be greatly appreciated.

Thanks folks

 

[namvet25]

This is a little difficult but I see you added vermiculite witch is not recommened because it holds to much moisture. I almost looks over watered or under watered,they look almost alike.I would stop foliar feeding for awhile and ley it dry out.As far as your ph I wouldn't worry too much abouit your runoff your not that far off.Your run off is probably going up when it runs through compost mix,You could lower your intake slightly and see if that changes ph down a bit.

 

[namvet25]

Oh by the way,thanks for the detailed report,good job.:tiphat:

 

[bobwobbly]

Hi Namvet,

Thanks for the quick reply. All pics are the same plant...my only child..she was flushed yesterday and I think that's why she looks a bit droopy, she's normally a perky little thing.
I've had the chlorosis from about day 7 and being a noob, panicked about the ph, self diagnosed every known deficiency and started spraying her, feeding her and then flushed her!!!!! We do worry about our babies!
I'll heed your advice and give her a break and then ease her back in gently.

Thanks again for your help mate

Bob

 

[namvet25]

She is still in a little shock from flushing so that's what i'm seeing.Just let her rest for a few days and she should perk up/

 

[bobwobbly]

Cheers mate....will treat her with kid gloves for the next week or so and keep the auld fingers crossed

 

[Muddy]

I'm surprised your pH is so high. I checked on your soil and the manufacturer says they shoot for 5.5 - 6.5. What I didn't see is if they add lime to their mix. If so, then it's possible the additional lime you gave could be the issue. If so, the flush you did should help. I do see signs of a deficiency but I don't think it's magnesium. Mag is well absorbed at the high pH you have. It's more likely the start of an iron deficiency. They can look very much alike, especially in the early stages. If the flush doesn't bring it down, you may need to look around and see if you can find some aluminum sulfate. That can be used to lower the soil pH. If you still have some of that soil, you may want to fill a pot, run some water through at 6.5 and see what the run off is. I'd be curious to know if it's in the range the manufacturer states.

 

[bobwobbly]

Hi Muddy,

Thanks for stopping by.

This has me truly confused. I didn't see any lime in the mix but it's the only thing I've added that's going to effect the ph.
I was shocked to find after the flush that the final run off was still at 7.2 and now that you say it, Iron makes much more sense!

I'll do a soil test as you suggest and let you know the result, in the mean time I'll hunt down some aluminium sulphate.

Will foliar feeding with a light nute solution have any benefit until I get the ph under control? Can't touch her for a few days as she's still recovering from the flush.

Thanks again Muddy

 

[Dazed]

Hi Muddy,

Thanks for stopping by.

This has me truly confused. I didn't see any lime in the mix but it's the only thing I've added that's going to effect the ph.
I was shocked to find after the flush that the final run off was still at 7.2 and now that you say it, Iron makes much more sense!

I'll do a soil test as you suggest and let you know the result, in the mean time I'll hunt down some aluminium sulphate.

Will foliar feeding with a light nute solution have any benefit until I get the ph under control? Can't touch her for a few days as she's still recovering from the flush.

Thanks again Muddy

Hey bro, for what it's worth I over did it with lime once and had similar run-off 7.1-7.2, I had a bit of iron def too, I used lemon juice to pH my water down low, sometimes to 5.6-5.8. This helped a lot, and the pH always slowly rises back up but that is a good thing, means everything is available at different points. Foliar feeding is always a good option if needed but not sure about chemical nutes I use organics.

Good luck bro,

 

[Muddy]

Hi Muddy,

Thanks for stopping by.

This has me truly confused. I didn't see any lime in the mix but it's the only thing I've added that's going to effect the ph.
I was shocked to find after the flush that the final run off was still at 7.2 and now that you say it, Iron makes much more sense!

I'll do a soil test as you suggest and let you know the result, in the mean time I'll hunt down some aluminium sulphate.

Will foliar feeding with a light nute solution have any benefit until I get the ph under control? Can't touch her for a few days as she's still recovering from the flush.

Thanks again Muddy

You're very welcome. Yes, you can foliar feed them in the mean time. For future reference you might want to contact the soil manufacturer and find out if they are adding lime. Also suggest they publish that on their web site and on the bag so people are aware.