Potassium sulfate (granular)

Heavy Metals (PPM)

Arsenic       <.5

Cadmium     <.1

Mercury        <.002

Lead         0.2

Nickel         0.1


Source:   Data From Oregon Department of             Ag Organic Certification Database

Potassium sulfate is a highly soluble and plant-available source of potassium.

In granular form, it can be used as a pre-plant amendment with a slightly slower release rate than powdered Potassium sulfate. It's also less dusty for easier spreading.