Bonide Nitrate of Soda (15-0-0) is a fast acting high soluble source of nitrogen. Nitrogen is one of the three primary plant nutrients, and it is used by the plant to provide rapid growth and deep greening of leaves. Because nitrogen can become depleted in the soil it is sometimes necessary to replace it so that plants can perform at their best. Guaranteed Analysis: Total Nitrogen (N) . . . . . . . . . 15.00% 15.00% Nitrate Nitrogen Plant Nutrients Derived From: Nitrate of Soda F1290 Due to changes in shipping regulations, we cannot ship this item to California.