Seaweed (kelp) is used for potassium...Potash is used as well.You can find both on e-bay.A good idea is to find out what some of the better nutrient companies are using in their ferts.Try to emulate and save some $$

You can use green sand which has many trace elements in it usually around a 0-0-3 N.P.K. ratio. kelp meal which is also good for condition your soil as well, usually around a .1-.5-2 ratio. Also as mentioned before wood ash from any type of hard woods, ash also gives many micro-nutrients as well as fast acting, but don't over do it because it tends to throw p.h. off.

Crushed granite, slow release, 0-0-5 67% silicas 19 trace minerals

Thanks guys

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Can I let them compost in the soil or do I have to compost them remotely and add them to the soil?

This is so funny, it's actually for my room mate's plants. He was gonna try banana peels but it seemed too simple. Everyone knows bananas have a lot of potassium!

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Well, I just checked the bag again. I've been using "Epsom Plus" from Espoma. It's epsom salts with potassium added. It's 0-0-22, plus you get the magnmesium and sulfur from the salts.

So, like you said, regular epsom salts don't have any K.

Check out the label on this bottle of molasses that I have used. Can be purchased at the grocery store in the baking goods section. A good source of potassium, not to mention calcium and magnesium and vitamin b as well. Molasses can be used throughout veg and flower. Another benefit it provides is a food source for beneficial bacteria if you are using any.

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I use this exact stuff. I just wish I knew exactly what the NPK ratio was when applied to plants. any one know how to figure it out?

Liquid seaweed or powdered kelp is your best bet. Greensand takes FOREVER to break down and generally does nothing for a short grow. If you reuse your soil it works better.