Where both magnesium and lime are required, dolomite is often more cost-effective than applying magnesium oxide and lime separately in the upper South Island and lower North Island.
Even when the liming value is not considered, dolomite is often used as a source of magnesium, as the availability of the magnesium is increased, relative to Magnesium Oxide, due to its finely ground nature.
Uses
Primarily used for dairy farming as both a magnesium source and liming source. It is also used in some horticultural situations where magnesium and calcium inputs are required
Application rates and advice
Dolomite is typically applied at rates of about 100-300kg/ha. However, rates of up to 1000kg/ha may be warranted, depending on the amount of capital Magnesium required. Dolomite is often mixed with RPR, Sulphur Super, and Potassium Chloride (Potash).
Storage and handling
Dolomite is safe to store - ensure it is kept dry
Source
Ngarua Lime near Nelson - it is then freighted around the country to Ravensdown stores