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D Through H
 
(D)
DAMPING OFF: Disease that attacks young seedlings and cuttings causing stem to rot at base.
DIRECT CURRENT (DC): An electric current that flows in only one direction.
DISSOLVED SOLIDS: The amount of dissolved solids, usually fertilizer salts, that are measured in water in parts per million.
DEPLETE: Exhaust soil of nutrients, making it infertile.
DESICCATE: Cause to dry up. Insecticidal soap desiccates its victims
DIOECIOUS: Having distinct male and female organs on different plants within the same species.
DOME: The part of the HID outer bulb opposite the neck and threads.
DOME SUPPORT: The spring like brackets that mount the arc tube within the outer envelope.
DRAINAGE: Way to empty soil of excess water: with good drainage, water passes through soil evenly.
DRIP AERATION: A hydroponic method wherein air pressure from a small air pump is used to percolate nutrient solution out through a ring of feeder tubing which encircles the plant.
DRIP LINE: A line around a plant directly under its outermost branch tips: roots seldom grow beyond the drip line.
DRIP SYSTEM: A very efficient watering system that employs a main hose with small water emitters.
DRY ICE: A cold, white substance formed when carbon dioxide is compressed and cooled; dry ice changes into CO2 gas at room temperature.
(E)
ELECTRODE: A conductor used to establish electrical arc or contact with non-metallic part of circuit.
ELONGATE: Growth in length.
ENVELOPE: Outer protective bulb or jacket of a lamp.
EQUINOX: The point at which the sun crosses the equator and day and night are each 12 hours long; the equinox occurs twice a year, in spring and fall.
(F)
FEED: Deliver nutrient to the plant via roots or foliage.
FEMALE: Pistillate, ovule, seed-producing.
FERTIGATE: To fertilize and irrigate at the same time.
FERTILIZER BURN: Over fertilization: first leaf tips burn (turn brown) then the leaves curl.
FLAT: Shallow (three inch) deep container, often 18 by 24 or 10 by 20 inches with good drainage, used to start seedlings or cuttings.
FLUORESCENT LAMP: Electric lamp using a tube filled with fluorescent material which has a low heat output.
FOLIAGE: The leaves or more generally, the green part of a plant.
FOLIAR FEEDING: Misting fertilizer solution which is absorbed be the foliage. Best to do when first turning on your lights.
FOOT_CANDLE: The unit is defined as the amount of illumination that the surface of an imaginary 1-foot radius sphere would be receiving if there were a uniform point source of one candle in the exact center of the sphere. The foot-candle is equal to one lumen per square foot. Foot-candle is a derived nit of illuminance from LUX. One foot-candle is equal to 10.76 LUX.
FUNGICIDE: A product that destroys or inhibits fungus.
FUNGISTAT: A product that inhibits fungus keeping it in check.
FUNGUS: A lower plant lacking chlorophyll which may attack green plants; mold, rust, mildew.
FUSE: Electrical safety device consisting of a metal that melts and interrupts the circuit when the circuit is overloaded.
FUSE BOX: Box containing fuses that control electrical circuits.
           (G)
GERMINATION: The process of causing the initiation and development of a plant from seed.
GENE: Part of a chromosome that influences the development of plants; genes are inherited through sexual propagation.
GENETIC MAKEUP: The set of genes inherited from parent plants.
GPM: Gallons per minute.
          (H)
HALIDE: Binary compound of HALOGENS with an electropositive elements.
HARDEN-OFF: To gradually acclimatize a plant to a more harsh environment. A seedling must be hardened-off before planting outdoors.
HERMAPHRODITE: One plant having both male and female organs; the breeding of hermaphrodites is hard to control.
HERTZ(Hz): A unit of frequency that cycles one time each second: a home with 60 Hertz AC current cycles 60 times per second.
HID: High Intensity Discharge.
HONEY DEW: A sticky, honey like substance secreted into foliage by aphids, scale and mealy bugs.
HOOD: Reflective cover of an HID lamp.
HOR: The abbreviation stamped on some HID bulbs meaning they must be burned in a horizontal position.
HORIZONTAL: Parallel to the horizon, ground or floor.
HORMONE: Chemical substance that controls the growth and development of a plant. Root-inducing hormones help cuttings root.
HUMIDITY: (RELATIVE): Ratio between the amount of moisture in the air and the greatest amount of moisture the air could hold at the same temperature.
HUMUS: Dark, fertile, partially decomposed plant or animal matter; humus forms the organic portion of the soil.
HYBRID: An offspring from two plants of different breeds, variety, or genetic makeup.
HYDRATED LIME: Instantly soluble lime, used to raise pH or sweeten soil.
HYDROGEN: Light or colorless, odorless gas; hydrogen combines with oxygen to form water.
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, Hydroton and other LECA mediums are favorites in ebb-and-flow and drip hydroponic systems.
HYGROMETER: Instrument for measuring relative humidity in the atmosphere.
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North Hollywood
CA 91601

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