Which lime source could be used to correct a magnesium deficiency in soil?

Dolomitic lime is particularly effective in correcting magnesium deficiencies in soil because it contains both calcium and magnesium carbonate. This dual composition allows it to raise soil pH while also supplying the necessary magnesium that might be lacking.

In contrast, calcitic lime primarily consists of calcium carbonate and does not provide magnesium, making it unsuitable for addressing magnesium deficiencies. Hydrated lime, which is calcium hydroxide, raises pH more aggressively than dolomitic lime and does not supply magnesium either. Quicklime, or calcium oxide, similarly increases soil pH rapidly but lacks magnesium content as well.

So, the use of dolomitic lime complements the soil's nutrient profile by addressing both acidity and magnesium deficiency, hence making it the best choice among the options provided.