Nitrosol Brimstone WDG Elemental Sulphur is a water dispersible product.  In agriculture most of the sulphur is supplied as anion sulphate which is mobile in the soil and is frequently washed away by rain.  As a result we often find soils that are sulphur deficient.  To build up sulphur levels you can add elemental sulphur which is converted by microbes into sulphate in the soil  

Sulphur is necessary for plants in manufacture of protein and chlorophyll (the reason why it works well for green plants).