EBB-AND-FLOW (OR FLOOD AND DRAIN)
A hydroponic system in which the medium, usually aggregate pebbles, is periodically flooded with nutrient solution and then drained again, feeding and aerating the medium and root system.
A hydroponic system in which the medium, usually aggregate pebbles, is periodically flooded with nutrient solution and then drained again, feeding and aerating the medium and root system.
FOLIAR FEEDING
Misting plants with fertilizer solution, which is absorbed by the foliage.
Misting plants with fertilizer solution, which is absorbed by the foliage.
FUNGICIDE
A product that destroys or inhibits fungus.
A product that destroys or inhibits fungus.
FUNGUS
Any of a major group (Fungi) of saprophytic and parasitic spore-producing organisms usually classified as plants that lack chlorophyll and include molds, rusts, mildews, smuts, mushrooms, and yeasts. Common fungal diseases that attack plants are "damping-off," Botrytis, and powdery mildew.
Any of a major group (Fungi) of saprophytic and parasitic spore-producing organisms usually classified as plants that lack chlorophyll and include molds, rusts, mildews, smuts, mushrooms, and yeasts. Common fungal diseases that attack plants are "damping-off," Botrytis, and powdery mildew.
GERMINATION
The process of causing the initiation and development of a plant from seed.
The process of causing the initiation and development of a plant from seed.
HARDEN-OFF
To gradually acclimatize a plant to a more harsh environment. A seedling must be hardened-off before planting outdoors.
To gradually acclimatize a plant to a more harsh environment. A seedling must be hardened-off before planting outdoors.
HORMONE
Chemical substance that controls the growth and development of a plant. Root-inducing hormones help cuttings root.
Chemical substance that controls the growth and development of a plant. Root-inducing hormones help cuttings root.
HYBRID
The offspring from two plants of different breeds, variety or genetic make-up.
The offspring from two plants of different breeds, variety or genetic make-up.
HYDRATED LIME
Instantly soluble lime, used to raise or lower pH.
Instantly soluble lime, used to raise or lower pH.
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 not really wick water effectively, Geolite and other LECA mediums are favorites in ebb-and-flow and drip hydroponic systems.
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 not really wick water effectively, Geolite and other LECA mediums are favorites in ebb-and-flow and drip hydroponic systems.
HYGROMETER
An instrument for measuring relative humidity in the atmosphere.
An instrument for measuring relative humidity in the atmosphere.
INTERNODAL
A portion of a plant stem between nodes.
A portion of a plant stem between nodes.
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.
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.
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.
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.
LEAF CURL
Leaf malformation due to overwatering, over fertilization, lack of magnesium, insect or fungus damage or negative tropism.
Leaf malformation due to overwatering, over fertilization, lack of magnesium, insect or fungus damage or negative tropism.
MACRONUTRIENTS
The primary nutrients N-P-K or the secondary nutrients magnesium and calcium.
The primary nutrients N-P-K or the secondary nutrients magnesium and calcium.
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 participates directly in the photosynthetic creation of oxygen from water.
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 participates directly in the photosynthetic creation of oxygen from water.
MEDIUM or MEDIA
The substrate or soilless material which supports the plant and absorbs and releases the nutrient solution in hydroponic horticulture.
The substrate or soilless material which supports the plant and absorbs and releases the nutrient solution in hydroponic horticulture.
MICRONUTRIENTS
Also referred to a TRACE ELEMENTS, including S, Fe, Mn, B, Mb, An and Cu.
Also referred to a TRACE ELEMENTS, including S, Fe, Mn, B, Mb, An and Cu.
MOLYBDENUM (MO)
This micronutrient is essential for nitrogen fixation and nitrate reduction.
This micronutrient is essential for nitrogen fixation and nitrate reduction.
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