Short answer: the three numbers are the percentages by weight of nitrogen (N), phosphate and potash in the product, always in that order. A label reading 8-15-36 contains 8% nitrogen, 15% phosphate and 36% potash. Phosphate and potash are not pure P and K By...
Short answer: a hydroponic nutrient is designed to supply every element a plant needs from water alone. Most garden fertilizers are designed to top up soil, which already holds calcium, magnesium and trace elements. In a Kratky container there is no soil, so those...
