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pH problems?

waltwalt

Member
How long has this problem been going on? 1 week
What STRAIN are you growing? Island Sweet Skunk x Blueberry Skunk
What was the establishing technique? (seed or clone?) Seed
What is the age of your plants? Seeded 5 weeks ago today.
How long have they been in the soil mixture they are in now? 3 Weeks
How Tall are the plants? 14"-24"
What PHASE (seedling, vegetative or flower) are the plants in? Vegetative
What Technique are you using? (SOG, SCROG etc) None
What size pots are you using? (Include how many subjects to pot) Currently in 3 gallon square pots.
What substrate/medium are you using? What brand of soil mixture are you using?(percentage of perlite, vermiculite...etc?)
Canna Bio Terra Plus

What Nutrient's are you using? Fox Farm Feeding.
How much of each nutrient are you using with how much water? Foxfarm started out at 1/4 strength after 2 weeks and has been ramped up to 80% strength.

How often are you feeding? Plants are watered every other day, nutrient solution is used every other feeding.
What is the TDS/EC/PPM of your nutrients used? Unmeasured.
What is the pH of the "RUN-OFF"? 7.2
What method of pH test was administered? Using Strips? pH pen? pH Pen
How often are you watering? Every other day.

When was your last feeding and how often are you feeding?
6 days ago they received nutrients, three days ago they received water, medium still moist.

What size bulb are you using? 400W MH
What is the distance to the canopy? 12"-16"
What is your RH Factor? (Relative Humidity) 45-55%
What is the canopy temperature?75-77F
What is the Day/Night Temp? (Include fluctuation range) 70-77F
What is the current Air Flow? (cfm etc.) 4" Grotek 210cfm fan with 6" cooltube.

Tell us about your ventilation, intake exhaust and when its running and not running ? Grow hut intake ports open, fan runs 24hrs/day vents into attic.

Is the fan blowing directly at plants? Oscillates across the plants.
Is the grow substrate constantly wet or moist? Yes
Is your water HARD or SOFT? Soft (Filtered)
What water are you using? Reverse Osmosis (RO)? Tap? Bottled? Well water? Distilled? Mineral Water? Filtered Tap Water that's been bubbled and pH adjusted.

Are you using water from a water softener? No.
Has plant been recently pruned, cloned or pinched? Some have.
Have any pest chemicals been used? If so what and when? No.
Are plant's infected with pest's? No.

I'm pretty sure my pH runoff being 7.2 means my roots are locked up and I should flush it out with 6.3 water mixed with mild nutrient solution, but just wanted to get some confirmation on that. I've provided pics that show various problems I'm seeing.

Any comments on these?

-ww
 

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RC_Colas

Well-known member
Veteran
Looks like you are overwatering the girls and they may be getting root rot. How often do you water them and can you post a shot showing them in their pots?

Cheers

RC_Colas
 

waltwalt

Member
So I've started flushing the plants. Runoff was 7.2 to start, I've run maybe 10x the volume at 6.3 through so far and the runoff is down to 6.7. Is this normal? I can't seem to get it lower than 6.7.

-ww
 

waltwalt

Member
My strain is Island Sweet Skunk crossed with Blueberry Skunk; I was told this particular strain likes a low pH of around 6.3 so that's what I've been watering it with since seed.

-ww
 

waltwalt

Member
I've got the runoff from all my plants down to 6.7-6.8 and then added a 'mild' nutrient solution of about 450ppm.
Hopefully in a day or two I start to see some recovery, or at least a stop in the deficiencies.

-ww
 

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