Help with brown spots

Dirk8==D~Diggler

Dirk8==D~Diggler

Well-Known Member
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Medium: 70/30 coco/perlite, 3 gal. fabric pots

Nutes: emerald harvest 3 part series (1/2 strength. 2 feeds then a cal-mag water rotation)

Strain: white widow auto by MSNL

Water: usually ~6.0 pH

Light: HLG 135 QB V2 r-spec running at ~90% 18 inches above canopy 24/0

Can someone help me identify what these brown spots are from please?? The only thing I know to do is give more cal mag.
 
PadawanWarrior

PadawanWarrior

Well-Known Member
Dirk8==D~Diggler said:
View attachment 4554720View attachment 4554722

Medium: 70/30 coco/perlite, 3 gal. fabric pots

Nutes: emerald harvest 3 part series (1/2 strength. 2 feeds then a cal-mag water rotation)

Strain: white widow auto by MSNL

Water: usually ~6.0 pH

Light: HLG 135 QB V2 r-spec running at ~90% 18 inches above canopy 24/0

Can someone help me identify what these brown spots are from please?? The only thing I know to do is give more cal mag.
Click to expand...
I would check the pH. They look like they're deficient in multiple ways to me, but I'm no expert. You need @Renfro for that kinda advice.
 
Dirk8==D~Diggler

Dirk8==D~Diggler

Well-Known Member
Renfro said:
You could throw more nutrients at it all you wish but it's not going to improve until the pH is addressed.
Click to expand...
The guys at my local hydro shop told me to aim between 5.8 and 6.2. If the pH of my runoff is coming out at 6.5 does that mean I need my input to be lower than 5.8?
 
Renfro

Renfro

Well-Known Member
Dirk8==D~Diggler said:
The guys at my local hydro shop told me to aim between 5.8 and 6.2. If the pH of my runoff is coming out at 6.5 does that mean I need my input to be lower than 5.8?
Click to expand...
Yes.

The key is that if your input pH is 6.0 and runoff comes out at 6.5, the pH in your root zone has to be higher than 6.5. Maybe more like 7.0 or even higher. Without a proper soil pH pen like the bluelab (can't use the cheapie ones) you could determine exactly where you sit and feed to offset that.

So if the root zone pH is 7.0 and you want to target 6.0 then you feed at 5.0 and monitor the pH swing that occurs between that feed and the next.

Medium pH Correction (Soil and Coco)

Checking and adjusting the pH of your root zone in soil or coco is a very important part of growing healthy plants. Often you will notice nutrient deficiencies despite the fact you know you have provided an ample feed at an appropriate pH level. When this happens it’s generally either...
www.rollitup.org
 
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