Nutrient disorders are caused by too much or too little of one or several nutrients being available. These nutrients are made available between pH ranges of 5 and 7 and a total dissolved solids (TDS) range of 800 to 3000 PPM. Maintaining these conditions is the key to proper nutrient uptake.
Nutrients Over twenty elements are needed for a plant to grow.
Carbon, Hydrogen and Oxygen – are absorbed from the air and
water.
Mineral Nutrients – are dissolved in the nutrient solution,
and the rest of the elements.
Primary or Macro-Nutrients
Nitrogen (N), Phosphorus (P) and Potassium (K) – are
the elements plants use the most.
Calcium (Ca) and Magnesium (Mg) – are secondary nutrients and used in smaller
amounts.
Micro-Nutrients or Trace
Elements
Iron (Fe), Sulfur (S), Manganese (Mn), Boron (B),
Molybdenum (Mo), Zinc (Zn) and Copper (Cu) – are micro-nutrients or trace elements.
Trace elements are found in most soils. Rockwool (hydroponic)
fertilizers must contain these trace elements, as they do not normally exist in
sufficient quantities in rockwool or water.
Other elements also play a part in plant growth. Aluminum, chlorine, cobalt, iodine, selenium, silicon, sodium and vanadium are not normally included in nutrient mixes. They are
required in very minute amounts that are usually present as impurities in the
water supply or mixed along with other nutrients.
*NOTE: The nutrients must be soluble
(able to be dissolved in water) and go into solution.
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