Magnesium is needed for both plant and animal health, but the levels required for plants are much lower than those needed for stock. Magnesium plays a critical role in carbohydrate metabolism and the cellular function of ruminants. It is also needed to prevent milk fever.
Regular applications of fertiliser magnesium can help to ensure that stock get the magnesium they need in their diet.
Altum provides a range of magnesium products that can be used on organic farms, including BioMag and our popular product, Enviromag. Other sources of magnesium are listed below.
Our dolomite is a naturally occurring mineral that is mined in the South Island. It is found in sedimentary rocks and is a calcium magnesium carbonate, containing 11.5% magnesium. Dolomite has a natural liming value, and this can be of use where magnesium is concerned, as plant availability of magnesium declines dramatically at low pH.
Serpentine is a naturally occurring rock that contains a high proportion of magnesium. The serpentine used by Altum is mined in the central North Island, and simply ground to produce a good, spreadable product. The magnesium is serpentine is released steadily over time, so this is an ideal product to choose when you want to maintain soil magnesium levels.
Limemag is a blend of serpentine rock and lime. The effect of this product is similar to that of dolomite, but the liming response is smaller. Limemag can be a more cost-effective choice when you require magnesium but do not need a large liming effect. Limemag contains 12% magnesium.
