Help identifying leaf issue

[Old ST1R]

Anyone know what’s causing this? Some of my Heisenbeans did it and now the clones are doing it. I think it’s an excess - maybe magnesium?

 

[J.James]

Looks like Potassium deficiency, But first check your PH

 

[pHup]

I love the bellow diagnostic chart for a quick reference. (Scoll to bottom)
Diagnostic flow chart

 

[Old ST1R]

Looks like Potassium deficiency, But first check your PH

View attachment 47792

Thank you! I tend to always check the pH of my water/feed, but rarely do on run off.I will try that. So if pH is OK, maybe just give them some flower nutes?

I love the bellow diagnostic chart for a quick reference. (Scoll to bottom)
Diagnostic flow chart

That’s a good one! Bookmarked! Thanks for the link.

 

[Highsince76]

I've read slurry test are better to go by then runoff.
Take like 250ml soil and 250ml water and let sit for 5 minutes. Check.
J.James may know better though.

 

[Old ST1R]

I've read slurry test are better to go by then runoff.
Take like 250ml soil and 250ml water and let sit for 5 minutes. Check.
J.James may know better though.

The plant in the picture is in only 250 ml of dirt! LOL. Experimenting with Bonsai Mothers.....

 

[Highsince76]

Lol. I'm sure you could divide it by 4 or so.
I've got something very similar going on with a few of mine. Slurry test shows them at 7 or 7.1.
I'm in the process of trying to add some sulfur to the soil now.

 

[H.A.F.]

Here are my basic "first glance" charts. If I have issues I do more research and ask lots of questions to make sure.

 

[H.A.F.]

The Jorge Cervantes one is the most comprehensive I think.

 

[J.James]

Slurry test procedure

1. Gather some soil from the test area.
2. Take the homogeneous sample and add equal parts of soil and distilled or deionized (DI) water in a 1:1 ratio. So, for 25 grams of soil you would add 25 mL of water.
3. Stir the sample for 5 seconds.
4. Let it sit for 15 minutes.
5. Start stirring the sample again after 15 minutes, and take your measurement