As fertiliser, GML has two functions. Its Calcium Oxide (CaO) content improves soil pH while its Magnesium Oxide (MgO) content provides the source for magnesium. Magnesium is essential for plants in the formation of chlorophyll. Magnesium also need for reinforcing rods, accelerating the maturity of plants and improving crop yield and quality.

Magnesium is an important nutrient for the plant to grow. It is the key element in making chlorophyll and photosynthesis cannot happen without it. Magnesium is also an active agent in many enzymes, and it has a big impact in metabolism, nitrogen metabolism, fat and active oxide action of the plant. Magnesium fertilizers is perfect for the acidic soil, highly leaching soil, sandy soil.