What forms of K (Potassium) and S (Sulphur) are used?

Futurespread uses sulphate of potash in its dairy blends. This is because most dairy farms are on sulphate-retentive soils, making this form of S very efficient. This is why many dairy farms have excessively high soil sulphate levels where super has been used. Super contains about double the ratio of S to P that pasture growing on a sulphate-retentive soil needs. As this sulphate anion accumulates in the soil over time, it eventually starts to leach out, automatically taking valuable cations such as calcium, magnesium, potassium and sodium with it. Using low S-content P fertilisers (DAP and RPR) allows additional S input to be tailored to the soil’s need. Additional S can be added as fine elemental S.

Fine elemental sulphur is used to supply sulphur on hill country farms, as these soils typically leach sulphate sulphur very easily.