Hydroponic Nutrient Levels

The average concentration of the elements, or nutrients, reqruied for plant growth should fall within these parameters:

Nitrogen (nitrate form) 70 -300 ppm
Nitrogen (ammonium form) 0 -31 ppm
Potassium 200 -400 ppm
Phosphorous 30 -90 ppm
Calcium 150 -400 ppm
Sulfur 60 -330 ppm
Magnesium 25 -75 ppm
Iron 0.5 -5.0 ppm
Boron 0.1 -1.0 ppm
Manganese 0.1 -1.0 ppm
Zinc 0.02 -.2 ppm
Molybdenum 0.01 -.1 ppm
Copper 0.02 -.2 ppm

NB: ppm = parts per million