Fertilizer – Number of Parts per million (1 mg/ 1 littler) of nutrient element in a nutrient solution when 1 gram of the fertilizer compound is dissolved in 1 gallon of water. Fertilizer N P K Ca Mg S Cl Potassium nitrate 13.75%N 44.5%K 36 97 Potassium sulfate 41.5%K 17%S 110 45 Muriate […]