Selenipedium aequinoctiale, second attempt

[Rick]

Any way to get some leaf nutrient concentrations measured?

That could tell you if overloaded on macros and imbalance of K, Ca, Mg.

If you do a flush test on the pot what is the conductivity?

 

[Berthold]

No, I have no possibility to measure the leaf nutrient concentration. But I can reduce the fertilizer what I did already in the new mix.
I didn't measure conductivity. But it should be in a normal range because I always water with my home made 20 µS/cm-water and also flush the pot from time to time.

But You are very right. A substrate with overloaded salt can kill the plant very quickly.

 

[Rick]

I haven't worked with the Akadama, Kanuma or Seramis, but I was shocked as to how much cation got absorbed into some basic Hydroton (Leca) that I was/am using on a Phrag.

When I finally checked some rinse water, conductivity was 5X higher than my max fert doses at the time.:sob:

 

[Berthold]

Yes, Rick, but most of the salt components are not plant active. So the high conductivity doesn't stalk the plants I think.

 

[Rick]

Yes, Rick, but most of the salt components are not plant active. So the high conductivity doesn't stalk the plants I think.

Berthold

At the time all the water input was MSU feed in RO water. So the most common cation was K building up.

If you use more surface water and hit with epsom salts you can change that around to less plant active Ca/Mg.:wink: