Is Finnish White AS used for its nitrogen content or its sulfur content?
Both. As a sulfur source, Finnish White AS supplies S in the readily available sulfate form. As a nitrogen source, Finnish White AS is extremely efficient because all of its nitrogen is in the ammonium form, which resists losses from leaching, volatilization and denitrification. Because Finnish White AS supplies both of these vital nutrients in a form that is immediately usable to plants, it is a cost-effective choice.
