Peters 20-20-20 + TE Professional

[Blueszz]

Hi Camille,

we have lots of calcium in our tapwater. I don't recall the amount calcium & magnesium from when I still had a dense planted fish tank. But I never had to supplement one of these.

When I looked at Rainmix I concluded I can't use it here unless I resort to reversed osmosis mixed with some tapwater. And that is not going to happen as I don't have a area to install a reverse osmosis unit. Ideally that would be near the bath tub. I wouldn't be the first one to forget it's running and flood for instance the bathroom or worse.

I dosed 20-20-20 at 0,5 gram/liter. Do you think I should dose less concentrated? Or only dose less as long as the plants don't show active growth?

I can't wait for spring!

[camille1585]

Originally Posted by Blueszz

I dosed 20-20-20 at 0,5 gram/liter. Do you think I should dose less concentrated? Or only dose less as long as the plants don't show active growth?

I can't wait for spring!

I'm following both Ray and Akerne's advice, which happen to come out to roughly the same thing. Ray suggests 100ppm N per week, and I usually water twice a week most of the year so that's 50pp per watering. Akerne's dosage (works out to 60ppm N) is because according to them it is sufficient for the majority of orchids, and no periodic flushing of the substrate is required at that dosage.

Your dosage is still fine (was sort of the 'standard' when I started on OB) but you might need to flush with tapwater every 4-5 waterings.

[Blueszz]

Originally Posted by camille1585

I'm following both Ray and Akerne's advice, which happen to come out to roughly the same thing. Ray suggests 100ppm N per week, and I usually water twice a week most of the year so that's 50pp per watering. Akerne's dosage (works out to 60ppm N) is because according to them it is sufficient for the majority of orchids, and no periodic flushing of the substrate is required at that dosage.

Your dosage is still fine (was sort of the 'standard' when I started on OB) but you might need to flush with tapwater every 4-5 waterings.

Ah, I didn't take watering twice a week into account. And I didn't think of the 100 ppm a week.

I now understand why you dose lower. Thank you for explanation.

Currently I water about once a week when a plant needs it. And I have a habit to flush media every now and then (no schedule) after "soaking" it for a while to dissolve as much minerals as possible.