It's still an answer lol.
And it's actually not a bad answer. If I tried to make a list of all the water soluble stuff I'd be typing all day,
.
For an example, Langbeinite is one that's highly soluble.
Langbeinite 0-0-22
SOLUBLE POTASH (K2O) 22.0%
MAGNESIUM (Mg) 10.8%
10.8% Water Soluble Magnesium
SULFUR (S) 22.0%
22.0% Combined Sulfur
CHLORINE (Cl) Max 3.0%
Derived from:
Langbeinite
Langbeinite is an ingredient in lots of amendment mixes. Take Bio-Live for example.
Most of the N is insoluble and will take awhile to breakdown by the microbes. But as they break them down they will also become more soluble.
The K is mostly from the Langbeinite which is basically fully soluble.
And then you've got shit like Organics Alive and others that are already broken down and soluble for instant access kinda.
organicsalivegarden.com
So as you can see it's not like I can just list all the soluble organics. If anyone else asked that question I would be more helpful, but he's a troll, and is just looking for a reason to be an ass.