Dolomitic limestone is a type of limestone that includes up to 50 percent dolomite. Normal limestone is primarily made up of calcite and aragonite, but dolomite forms in limestone when the calcium ions in the calcite part of the limestone are replaced by magnesium ions ó this process is called dolomitization.

Dolomitic limestone was once referred to as magnesian limestone in the United States Geological Survey publications, but is now known as dolostone, dolomite rock, dolomite limestone, or dolomitic limestone. Dolomite is a mineral which contains large amounts of calcium and magnesium, which makes it a good fertilizer for nutrient deficient soil.

In addition to working as a fertilizer, dolomitic limestone is also useful for soils that are too acidic, or have an abnormally low pH level. Adding dolostone for the purpose of raising the soilís pH level is known as liming. Dolomite stone being sold as liming material typically contains a minimum of 30 percent magnesium.

Dolomite lime fertilizer is certainly allowed in organic gardening. It is not inherently bad, but how it is used in the garden is often detrimental.
The belief is that minerals in your soil are continuously being leached by rain and consequently your soil is always moving towards more acidic.

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