Fine Dolomite Lime has long been a favourite pH stabilizer for gardens. It is difficult to apply too much as long as it is thoroughly mixed into the soil. Dolomite has a neutral pH of 7, and can never raise the pH above 7. It stabilizes the pH safely.
Compensate for acidic soil by mixing dolomite with soil before planting. Dolomite is a compound of Mg (Magnesium) and Ca (Calcium). Dolomite does not prevent toxic salt build-up caused by impure water and fertilizer build-up. Proper fertilizer and regular leaching (To remove soluble or other constituents from by the action of running water through the medium (soil makeup)) helps flush away toxic salts. When purchasing look for Dolomite Flour, the finest fast-acting dust-like grade available. Coarse Dolomite could take a year or more before it becomes available for uptake by roots. Improperly mixed dolomite will stratify, forming a cake or layer that burns roots and repels water.

Limestone Dolomite Fine Dolomitic Flour prilled lime - eBay (item 300381033744 end time Jan-02-10 10:11:00 PST)

Here are techinical specs on it, very HIGH magnesium, a BIG plus...
http://www.bakerlime.com/images/Prod...eets/AG-18.pdf
daydream Reviewed by daydream on . Difference between dolomite and garden lime? What is the difference between fine dolomite lime and garden lime / pulverized limestone? I use garden lime outside in my garden. I want to mix my own indoor potting soil that calls for one cup of fine dolomite lime. What's the difference? I've also heard of hydrated lime. Is that garden lime, either? Rating: 5