Calcium nitrate is a colorless anhydrous salt obtained by treating limestone with weak nitric acid. It also forms during the absorption of nitrogen oxide by milk of lime.
Like other, related alkaline-earth-metal nitrates, calcium nitrate decomposes upon heating to release nitrogen dioxide. The compound dissolves quickly in water and can be absorbed rapidly by plants in all soils and climates, according to Azot-Trans. The nitrogen in calcium nitrate also helps a plant absorb other nutrients in the soil, while the calcium provides the necessary nutrition to promote cell growth in a plant.
Calcium nitrate is also used to prevent odors in waste water by creating an anoxic biology, which stops the metabolism of odor-producing sulfates.
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