What is GML (Ground Magnesium Limestone)?  
 
Soil pH GML (ton/hec)
4.0 – 4.5
3.0
4.5 – 5.0
2.5
5.0 – 5.5
2.0
5.5 – 6.0
1.5
6.0 – 6.5
1.0
6.5 – 7.0
0.75
GML is extracted from the mineral dolomitic limestone rock hill - Ca Mg (CO3) 2.

GML is used as a fertiliser and contains at least 15% of MgO. MgO in dolomitic limestone is much higher than limestone, which is usually very low in MgO.

GML is the dolomitic limestone which is ground into fine powder form, in which approximately 70% passes through a 100 mesh sieve size.

GML has a dual function. Its CaO content improves soil pH while its MgO content provides the source for magnesium. This is essential for plants, especially for the formation of chlorophyll, reinforcing rods, accelerating the maturity of plants and improving crop yield and quality.
 
How to apply GML?  
 
Plant Optimum Soil pH
Palm oil
5.5 – 6.5
Koko
5.5 – 7.0
Sugar cane
6.0 – 7.0
Coffee
5.5 – 7.0
Rubber
5.5 – 7.0
Corn
6.0 – 7.0
Paddy
5.0 – 7.0
Rambutan
6.0 – 7.5
Mango
6.0 – 7.0
Star fruit
6.0 – 8.0
Peanut
6.0 – 7.0
Potato
5.5 – 7.5
Vegetable
6.0 – 7.5
Flower
6.0 – 8.0
Determine the required quantity of GML to be worked into the soil.

Apply GML 3 - 4 weeks prior to the planting or the application of other fertilizers. GML breakdowns rapidly and completely during this time.

Apply GML evenly around the tree crown for annual crops.

Generally, at least 2.5 tons / hectare of GML is recommended for plants that require liming. The quantity of GML is determined based on soil pH and crop types.
 
 
 

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