Glacial Rock Dust benefits soil because it is full of minerals and a very important part of any soil mix.
Glacial Rock Dust weighs about 9 ounces per cup
An excerpt from www.Remineralize.org
Soil Remineralization (SR) creates fertile soils by returning minerals to the soil in much the same way that the Earth does: during an Ice Age, glaciers crush rock onto the Earth's soil mantle, and winds blow the dust in the form of loess all over the globe. Volcanoes erupt, spewing forth minerals from deep within the Earth, and rushing rivers form mineral-rich alluvial deposits.
Within silicate rocks is a broad spectrum of up to one hundred minerals and trace elements necessary for the well-being of all life and the creation of fertile soils. Glacial moraine or mixtures of single rock types can be applied to soils to create a sustainable and superior alternative to the use of ultimately harmful chemical fertilizers, pesticides, and herbicides.
Soil Remineralization has been shown in scientific studies to achieve fourfold increases in agricultural and forestry (wood volume) yields and to produce both immediate and long-term benefits from a single application.
Hundreds of thousands of tons of appropriate rock dust for soil and forest regeneration are stockpiled by the gravel and stone industry.
How To Use
For soil building or top dressing, apply at a rate of 1 cup per cubic foot of soil.