Growth Science Nutrients - Base A (5.5-0-0) : Base Nutrients (Gallon) While Base A and Base B form the foundation of the Growth Science nutrient regimen, Growth Science is a 5 part fertilization system. Base A provides nitrogen and essential micronutrients while Base B provides phosphorous and potassium. Most manufactures separate ingredients into as many bottles as possible and charge a premium for branding, but the vast majority of growers are wising up to this and are looking for a high quality yet affordable solution. Growth Science is designed to be a simple to use nutrient regimen that contains everything needed to help achieve maximum yields of high quality finished product. Growth Science is optimized for soil, coco, and all hydroponic mediums.