Also referred to a TRACE ELEMENTS, including S, Fe, Mn, B, Mb, An and Cu.

Supplying soil and roots with air or oxygen. Geolite is an example of a medium with excellent aeration. In some hydroponic systems, a nutrient solution is aerated by the output of an aquarium pump.

A system in which the roots of a plant are consistently or intermittently misted with fine droplets of nutrient solution.

Refers to medium or nutrient solution with a low pH; an acidic solution has a pH below 7.

Refers to medium or nutrient solution with a high pH; any pH over 7 is considered alkaline.

Fertilizer high in phosphorus (P) that increases flower yield.

The function of this micronutrient is not well understood, but it is suspected that it might aid carbohydrate transport.

Leaf tips that turn dark from excess fertilizer and salt burn.

Calcium is vital in all parts of plants to promote the translocation of carbohydrates, healthy cell wall structure, strong stems, membrane maintenance and root structure development. Calcium is a macronutrient.

A colorless, odorless, tasteless gas in the air necessary for plant life. Occurs naturally in the atmosphere at .03%.