S-K-Microsource is Heart Of Nature’s premium organic agricultural mineral line. Sourced from million year old volcanic deposits rich in essential minerals that lower pH, enrich soil and invigorate plants.

S-K-Microsource Ag Grade 

Best used in broadcast type applications where the entire field is intended to be treated. Great for pH reduction & maintenance and as a pre-plant amendment. S-K-Microsource Ag Grade is our base material crushed and straight from the mine.

S-K-Microsource Ultrafine

Best used in solution with water to create a liquid amendment. Great for pH reduction of irrigation water and as a foliar spray. S-K-Microsource Ultrafine is our base material milled down to a soluble powder.

S-K-Microsource +Humates

Best used in broadcast type applications where the entire field is intended to be treated. Great for pH reduction & maintenance and as a pre-plant amendment. S-K-Microsource +Humates is our base material with the added benefits of humate. 

S-K-Microsource Prill

Best used in targeted row banding type applications. Great for pH reduction, new plantings and as a pre-plant amendment. S-K-Microsource Prill is our base material with the added benefit of a prilled format.

S-K-Microsource +Humates Prill

Best used in targeted row banding type applications. Great for pH reduction, new plantings and as a pre-plant amendment. S-K-Microsource +Humates Prill is our base material with the added benefit of humate in a convenient prilled format.

Organic Magic

The amazing benefits of the S-K-Microsource line now available to garden center retailers. Packaged with the homeowner in mind and value sized at 40lbs with a coverage of up to 4,000sqft. Organic Magic is in an easy to apply prilled format with the added benefits of humate, and added essential nutrients.