Dolomite contains magnesium and calcium but will also raise the PH of your soil. Other lime produces do not contain magnesium so would not be a good substitute. Crushed egg shells are a good source of calcium for your soil. I'm not sure if it is organic but epsom salt is a good source of magnesium.
Most vegetables and fruits prefer neutral to slightly acid soil so you should check the PH of your soil before adding either dolomite or lime to your soil. You can buy a PH meter at most garden centers I got mine for about $9.
Okay - so I found a "recipe" for organic fertilizer online that I was really intrigued by. (4 parts seed meal, 1 part dolomite lime, ½ part bone meal -or- 1 part soft rock phosphate & ½ part kelp meal). You'll notice that the recipe calls for "dolomite lime", but since our soil here is nowhere near acidic, I cannot find dolomite lime anywhere. I found "hydrated" lime, however.
I did an online search in which the warning was to NOT substitute... but these were forums in which the lime was being used on its own, not with other ingredients. I'm wondering about using less of the hydrated lime than the recipe calls for in dolomite... thoughts?
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