Top dressing with lime/ how much?

So I have low pH and looking to raise the pH with dolomite lime.

How much should one top dress with for 4 gal pots?

There’s no lime in peat based soil just now that’s why I’m having issues.

any recommendations appreciated!

cheers

1/4of a cup will be enought to start i guess!

Great topic,was researching this last night.A cup per 7.5 gallons is what i found.
But would this not depend on what your base water is and what your soil is at?

myke said:

Great topic,was researching this last night.A cup per 7.5 gallons is what i found.
But would this not depend on what your base water is and what your soil is at?

Click to expand...

I was guessing that he add some perlite in is mix like 33% thats why i was aiming low when my promix hp it 6 month old 2 cyle i add 1/3 off a cup each 5 gallon and they love it .my premix amendement already have a little oyester shell and lime in it but not enought to keep up with the ph.

myke said:

Great topic,was researching this last night.A cup per 7.5 gallons is what i found.
But would this not depend on what your base water is and what your soil is at?

Click to expand...

Water is very soft - 34ppm usually. I always seem to get pH crashes mid-late flower and now have the tools to find out more.

pH was at 4.8 which is causing me lots of issues. Managed to get this up to 5.4-5.7 by top dressing with worm castings and Flushing the media.

@swedsteven

Just worried about burning the roots? Is top dressing in one go ok?

This is them a week apart after the pH crashed.

Also the black right one is starting to progress the same. That’s in a 3 gal airpot and is showing pH 5.06

Oops forgot to add pictures;

I would start low say 2 tbl spoons per pot.Do you have a probe type ph pen?

myke said:

I would start low say 2 tbl spoons per pot.Do you have a probe type ph pen?

Click to expand...

Yeah it’s a good one - apera ph60s spear ph tester.

Its calibrated and also my run off when I measured it was 5.8 after feeding 6.5 so would indicate the soil is around 5.1