Leaf spots

[Steve1]

Hello all, one of my plants had a couple of leaves near the top that have developed these spots. They’re 4 1/2 weeks into flower. A chart I have says a possible potassium deficiency? I have been all over all of the plants and see no bugs or anything. I watered them yesterday with Fox Farm Beastie Bloomz (0-50-30). Just keep monitoring or is there another problem?

 

[umbra]

I'd say overall health is poor. More than just K, I think ph is off and you have nute lockout

 

[Steve1]

Here are some current photos of the plant. I ph my water to 6.0-6.5, it’s been 3weeks since I calibrated the tester. It’s the only plant of 4 doing this. Should I flush it or re-calibrate and just you ph’d water?

 

[umbra]

I'd do all 3. Calibrate your ph meter, flush with ph'd water, then just ph'd water and see.

 

[stinkyattic]

Youre in the pH range for coco. Unless you're actually in coco, you're too low. If you ARE in coco, you need calcium as well as fixing your main lockout.
You're approaching finish so fix what you can and apply the experience to your next round.

 

[Steve1]

I'd do all 3. Calibrate your ph meter, flush with ph'd water, then just ph'd water and see.

Thanks! I always appreciate the advice I get here

Youre in the pH range for coco. Unless you're actually in coco, you're too low. If you ARE in coco, you need calcium as well as fixing your main lockout.
You're approaching finish so fix what you can and apply the experience to your next round.

what would be the proper ph for soil? I’ve heard 5.6-6.5 for soil. I usually shoot for around 6.0-6.3. I just calibrated my meter and measured the ph of the runoff and it was 5.22. I have a ppm meter coming and I may have to get another ph meter because I don’t have faith in the one I have

 

[stinkyattic]

6.5-6.8, your runoff is seriously low so you should be watering as close to 7 as you can get without going over.
Ph indicator drops are helpful to double check things, and for emergencies like a bad probe on your meter. When I ran hydro, I did a lot of my routine checks just with indicator solution. It is another option and IMVHO a good backup to keep in the bag o tricks.