In many cases, fertilisers are still incomplete. Plants also require much smaller proportions of sulphur, sodium, calcium, magnesium and trace elements such as boron, cobalt and manganese, yields being reduced if these are in short supply. Rosier therefore enriches many of its compound fertilisers with these essential trace elements. With its flexible production units, Rosier is able to offer relatively small production runs. We can supply special product quantities from as little as 500 tonnes. If required, the granules can be dyed.