YaraMila ACTYVA S YaraMila ACTYVA S (16-15-15 + 6.5% SO3) is a uniform granular fertiliser specifically designed for the winter wheat crop to supply the crops requirements of phosphate and potash together with nitrogen and sulphur as the first dressing in the spring. This product can however be used in many different situations and crops besides wheat and offers a good base starter fertiliser for oilseed rape. Available in England, Wales, Scotland and Northern Ireland.