NPK 4-18-38 plus Calcium and Magnesium A complete essential nutrient formula for all vegetables and herbs. supports plant grows by suppling all macro and micro nutrients for all stages of plant growth. Suitable for both hydroponic and soil growing This complete nutrients comes in three parts: 1) NPK 4-18-38 2) Calcium Nitrate 3 Magnesium sulphate All feeding instructions are listed on package.