Calcium nitrate is a water-soluble fertilizer that contains calcium and nitrogen. It is a colorless salt that is commonly found in tetrahydrate form. It has many uses, including

Calcium nitrate is a water-soluble fertilizer that contains calcium and nitrogen, and can be beneficial for many crops:
Disease prevention: Calcium nitrate can help plants tolerate disease infections, and prevent cracking of fruits and vegetables. For example, it can help prevent blossom end rot in tomatoes, cork spot, and bitter pits in apples.
Improved cell structure: Calcium nitrate improves cell walls, which can lead to better quality produce.

Faster growth: Calcium nitrate can help plants grow faster and produce larger vegetables.

Increased shelf life: Calcium nitrate can help increase the shelf life of fruits.

Neutralizes acids: Calcium nitrate can neutralize acids to detoxify the plant.

Calcium nitrate can be applied in a number of ways, including:

Drip irrigation: Mix 1.5 to 2.5 grams of fertilizer per liter of water.

Leafy spray: Mix 0.5 to 0.8% grams of water soluble calcium nitrate per liter of water.

Direct application to the soil: Apply 25-50 kilograms per acre.