PH at 5.7 but looks like PH symptoms?

[BCBudNerd]

hi,

Leaves started to get brown spots and what looks like a small amount of nutrient burn on the tips. Thought either calcium deficiency or nute burn so the last two waterings have been plain water, calmag and velokelp PH’d at 5.7.

I am growing in soil under a 315 sunsystem lec about 12” from canopy and they are white widow autos 7 weeks in.

They seem to be getting worse.

Thank-you for any help. All signs seem to point to PH issues but the PH is low (at the water not at the soil)

 

[BCBudNerd]

 

[Budzbuddha]

Phosphorus Deficiency ....

What medium are you in ... ?

 

[BCBudNerd]

Phosphorus Deficiency ....

What medium are you in ... ?

Growing in promix soil from a local grow shop.

 

[Budzbuddha]

Bump ph up to 6.0 ( range in the phosphorus better ) / maybe increase the feed ratio too.

 

[Budzbuddha]

Plant has typical necrotic brown spots / symptoms. Plants are hungry for it as they are flowering.

 

[BCBudNerd]

Bump ph up to 6.0 ( range in the phosphorus better ) / maybe increase the feed ratio too.

Just read about phosphorus deficiency and I have all the symptoms including purple leaf stems which I have had for a while now. Shoot I wonder if that’s why the one that is really bad is so late to flower?

I have been feeding the below nutes at every feeding at half strength.

I just watered. Should I flush through with a full strength nute dose now or wait until the next watering?

 

[Renfro]

Promix should be run at a pH of 6.5 - 6.8

 

[hotrodharley]

View attachment 4365678

Just read about phosphorus deficiency and I have all the symptoms including purple leaf stems which I have had for a while now. Shoot I wonder if that’s why the one that is really bad is so late to flower?

I have been feeding the below nutes at every feeding at half strength.

I just watered. Should I flush through with a full strength nute dose now or wait until the next watering?

Wait until the next needed watering. You already have enough problems.

 

[Chip Green]

Maintain composure. Blasting nutrition into the media will not "reverse" what is seen. Nothing good happens fast in the grow room.
I've had many, many plants look like that, and far, FAR worse, with satisfactory yield.
I've long battled chronic underfeeding, due to deep seeded internal paranoia of over feeding/watering.
Look to improve, without knee-jerk reaction.

 

[BCBudNerd]

Maintain composure. Blasting nutrition into the media will not "reverse" what is seen. Nothing good happens fast in the grow room.
I've had many, many plants look like that, and far, FAR worse, with satisfactory yield.
I've long battled chronic underfeeding, due to deep seeded internal paranoia of over feeding/watering.
Look to improve, without knee-jerk reaction.

Ok I will be patient.

Thanks for the advice. I just PH’d the runoff I cleaned out of the trays and it’s at 5.15 - yikes