DTE Solution Grade Potassium Sulfate is an organic powder that contains two crucial plant nutrients - potassium (K) and sulfur (S). Plants can't survive, much less thrive, without the support that these two nutrients provide. In fact, almost every major physiological function a plant performs requires one or both of them. DTE Solution Grade Potassium Sulfate supplies a strong dose of these nutrients in a highly available water-soluble sulfate form that is designed for efficient delivery and immediate uptake. A soil or plant tissue analysis or a home soil test is recommended before use, but application can be made without one (see instructions for details).