Calcium Nitrate Tetrahydrate is a 100% water soluble crystalline. Calcium source for uses compatible with nitrates and lower (acidic) pH. It is a highly soluble source of two plant nutrients. Its high solubility makes it popular for supplying an immediately available source of nitrate and calcium directly to soil, through irrigation water, or with foliar applications. Specification:N:11.74%,CaO:23.5%