Many hydroponic formulas have been developed over the past 40 years with some designed for specific plants while others are designed for general hydroponic gardening. For plant growth, the concentration of individual elements must stay within certain ranges that have been determined through scientific experimentation.
The average concentration of these elements 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 .5 -5.0 PPM
Boron .1 -1.0 PPM
Manganese .1 -1.0 PPM
Zinc .02 -.2 PPM
Molybdenum .01 -.1 PPM
Copper .02 -.2 PPM
*PPM = parts per million
Nutrient Requirements and Testing
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