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Photoperiod
Day length; the relationship between the length of light and dark in a 24 hour period.
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Photosynthesis
The process by which plants use light energy to collect carbon dioxide from the atmosphere and convert it to chemical...
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Potassium (K)
Potassium promotes disease resistance and good development of carbohydrates, starches and sugars, and it increases fruit production. Potassium is a...
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Propagate
Sexual propagation: to produce seed by breeding different male and female flowers. Asexual propagation: to produce plantlets (also known as...
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Pyrethrum
Natural insecticide made from the blossoms of various chrysanthemums.
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Reservoir
The container in a hydroponic system which holds nutrient solution in reserve for use.
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Rockwool
Inert, soilless growing medium consisting of woven, thin strand-like fibers made from molten volcanic rock and limestone, which is heated...
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Secondary nutrients
Calcium (Ca) and magnesium (Mg) are considered to be the secondary nutrients.
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Systemic
Used in reference to a disease within the plant tissue, not initiated from the external cells. Also refers to materials...
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Nitrogen (N)
Nitrogen is used in various forms to promote rapid vegetative growth, leaf, flower, fruit and seed development, and chlorophyll development;...
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Vermiculite
Mica which has been processed and expanded by heat. Vermiculite has excellent water-retention qualities and is a good soil amendment...
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N-P-K
The N value is the percentage of elemental nitrogen by weight in the fertilizer. The value for P is the...
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Wick
Part of a passive hydroponic system using a wick suspended in the nutrient solution. The nutrients pass up the wick...
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Nutrient solution
The mixture of water and water-soluble nutrients which is provided to the plants for nourishment in a hydroponic system.
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Zinc (Zn)
Like copper and manganese, zinc is linked to chlorophyll synthesis.
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Nutrients
The elements needed by plants for normal growth and health. The major nutrients (MACRONUTRIENTS) are nitrogen (N), phosphorus (P), and...
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Perlite
Sand or volcanic glass which has been expanded by heat; perlite holds water and nutrients on its many irregular surfaces....
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pH
A scale from 1 to 14 that measures the acid to alkaline balance of a growing medium (or any other...
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Phosphorus (P)
Phosphorus promotes and stimulates early growth and blooming and root growth. It hastens maturity and seed growth, and contributes to...
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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...
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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...
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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.
