Dolomite consists primarily of calcium and magnesium, two minor nutrients essential for healthy tomatoes. It is generally obtained from pulverizing limestone. It is useful in the home garden as a soil pH adjuster when applied correctly. Tomato plants absorb the most nutrients from the soil when its pH falls within the desired range. Dolomite also increases magnesium levels in the soil. In areas with a known magnesium deficiency, this is crucial for growing healthy tomatoes.