Potassium Deficiency?

Look at CO2/NO3 frist.

Regards,
Tom Barr

 

I tend to think it is an old wives tale about holes in many plants due to low K+.
Sometimes, yes, it might be true, but I've seen much more evidence with CO2 and NO3 with holes and stunted growth.

If you have good growth and no stunting, and you have a few holes on the lower leaves, then perhaps.

I tend to redo everything and look over things in each area rather than chasing one nutrient.

You have a much higher success rate at fixing the issue this way.
You do not get a chance to isolate and study the deficiency is the trade off, which most folks don't really wanna do anyway.

So do a large water change,. dose things back, add a tad more KNO3, and tweak the CO2 a bit more **slowly**.

Regards,
Tom Barr

 

Now without any prior experience, and given what you see/read about on the web, that all the symtoms appear very similar, what are the odds out say 20 possible things it might be(could be more or less), that you will get lucky?

Not much.

Now if you use an EI approach, that rules out many things.
So you really are left with general maintenance and CO2, if you have enoghyb light and not too much and 10 hours per day, all that remains really is patience and CO2.

That makes my job and growing plants much easier.

It also allows me to isolate things very effectively, same with anyone that wants to delete say just PO4, or just NO3, or just Traces, or just K+(few folks do though, because few have non K+ based NO3 and PO4, although sodium based salts of NO3/PO4 and Ca(NO3)2 are easy to acquire to drive the K+ down.

So many never know unless they try to do it on purpose what K+ issues look like or not.

You also cannot use TMG, it has K+ in it also.
So what I am saying, if you add ferts, it's not likely you have K+ issues in most cases.

K2SO4
KNO3
KH2PO4
TMG

All add K+

Regards,
Tom Barr

 

A cheap 50 cent plastic pipette works great to remove the liquid, you may also rinse out with the KH ref solution.


Regards,
Tom Barr