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Hydrated lime
Instantly soluble lime, used to raise or lower ph....
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Hydroton
One of several brand names/varieties of clay aggregate medium (also known as LECA for light expanded clay aggregate). It is a lightweight, porous substrate with excellent aeration. Because it does...
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Hygrometer
An instrument for measuring relative humidity in the atmosphere....
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Internodal
A portion of a plant stem between nodes....
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Iron (Fe)
This micronutrient acts as a catalyst in the photosynthesis/respiration process, and is essentialp for the formation of sugars and starches. Iron also activates certain other enzymes....
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Krebs cycle
A series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-coa derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy....
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Leaf curl
Leaf malformation due to overwatering, over fertilization, lack of magnesium, insect or fungus damage or negative tropism....
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Macronutrients
The primary nutrients N-P-K or the secondary nutrients magnesium and calcium....
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Manganese (Mn)
This micronutrient activates one or more enzymes in fatty acid synthesis; it also activates the enzymes responsible for DNA and RNA production. Closely associated with copper and zinc, manganese also...
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Medium or media
The substrate or soilless material which supports the plant and absorbs and releases the nutrient solution in hydroponic horticulture....
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Micronutrients
Also referred to as trace elements, including S, Fe, Mn, B, Mb, An and Cu....
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Molybdenum (Mo)
This micronutrient is essential for nitrogen fixation and nitrate reduction....
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Necrosis
The dying of plant tissue, usually the result of serious nutrient deficiency or pest attack....
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Nft (nutrient film technique)
A hydroponic method in which nutrient is fed into grow tubes or trays in a thin film where the roots draw it up. This “nutrient film” allows the roots to...
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Acid
An acidic solution has a ph below 7....
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Aeration
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...
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Aeroponics
A system in which the roots of a plant are consistently or intermittently misted with fine droplets of nutrient solution....
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Alkaline
Any ph over 7 is considered alkaline....
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Bloom booster
Fertilizer high in phosphorus (P) that increases flower yield....
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Boron (B)
The function of this micronutrient is not well understood, but it is suspected that it might aid carbohydrate transport....
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Burn
Leaf tips that turn dark from excess fertilizer and salt burn....
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Calcium (Ca)
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....
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Carbon dioxide (CO₂)
A colorless, odorless, tasteless gas in the air necessary for plant life. Occurs naturally in the atmosphere at .03%....
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Chlorine (Cl)
This micronutrient is essential for photosynthesis, where it acts as an enzyme activator during the production of oxygen from water....
