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A through C
 
(A)
ALTERNATING CURRENT (AC): An electric current that reverses its direction at regular intervals. Homes have AC.
ACID: An acid or sour substance has a pH below 7.
AERATION: Supplying soil and roots with air or oxygen.
AEROPONICS: Growing plants by misting roots suspended in air.
ALKALINE: Refers to substances with high pH. Any pH over 7 is considered alkaline.
ALL-PURPOSE (General Purpose) FERTILIZER: A balanced blend of N-P-K; all purpose fertilizer is used by most growers.
AMENDMENT: Fortifying soil by adding organic or mineral substances in order to improve texture, nutrient content or biological activity.
AMPERE (AMP): The unit used to measure the strength of an electric current.
ANNUAL: A plant that normally completes its entire life cycle in one year or less. Tomatoes are examples of annual plants.
ARC: Luminous discharge of electricity (Light) between two electrodes.
ARC TUBE: A quartz container for luminous gases, also houses the arc in HID lights.
AUXIN: Classification of plant hormones; Auxins are responsible for foliage and root elongation.
(B)
BACTERIA: Very small, one celled organisms.
BENEFICIAL INSECTS: A good insect that eats bad flower and vegetable munching insects.
BIODEGRADABLE: Able to decompose or break down through natural bacterial or fungal action, substances made of organic material are biodegradable.
BLOOM BOOSTER: Fertilizer high in Phosphorus (P) that increases flower yield.
BOLT: Term used to describe a plant that has gone to seed prematurely.
BONSAI: A very short or dwarfed plant.
BORON (B): The function of this micronutrient is not very understood, but it is suspected that it might aid in carbohydrate transport.
BREAKER BOX: Electrical circuit box having on/off switchers rather than fuses.
BREATHE: Roots draw in or breathe oxygen, Stomata draw in or breath carbon dioxide.
BUD BLIGHT: A withering condition that attacks flower buds.
BUFFERING: The ability of a substance to reduce shock and cushion against pH fluctuations.
BULB: The outer glass envelope or jacket that protects the ARC tube of an HID lamp.
BULBS: Common are tulips and daffodils planted in the fall for spring blooms, or forced indoors for winter blooms.
BURN: Leaf tips that turn dark from excess fertilizer or salt burns.
(C)
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 macronutrientt.
CALYX: The pod harboring female ovule and two protruding pistils, seed pod.
CARBON DIOXIDE (CO2): A colorless, odorless, tasteless gas in the air necessary for plant life. Occurs naturally in the atmosphere at 0.03%.
CARBOHYDRATE: Neutral compound of carbon, hydrogen and oxygen . Sugar, starch and cellulose are carbohydrates.
CAUSTIC: Capable of destroying, killing or eating away by chemical activity.
CELL: The base structural unit that plants are made of; cells contain a nucleus that houses its DNA.
CELLULOSE: A complex carbohydrate that stiffens a plant's tissue.
CFM: Cubic feet per minute.
CHELATE: Combining nutrients in an atomic ring that is easy for plants to absorb.
CHLORINE: Chemical used to purify water.
CHLOROPLAST: Containing chlorophyll.
CHLOROSIS: The condition of a sick plant with yellowing leaves due to inadequate formation chlorophyll. Chlorosis is caused by nutrient deficiency, usually iron or imbalanced pH.
CLAY: Soil made of very fine organic mineral particles.. Clay is not suitable for container gardening.
CLIMATE: The average condition of the weather in a garden room or outdoors.
CLONE: A plant produced through asexual reproduction including, but not limited to, cuttings, layering and tissue culture.
COLOR SPECTRUM: The band of colors (measured in nanometers) emitted by a light source.
COLOR TEMPERATURE: The relative whiteness of a piece of tungsten steel heated to that temperature in degrees Kelvin.
COLOR TRACER: A coloring agent added to many commercial fertilizers so the horticulturist knows there is fertilizer in the solution.
COMPACTION: Soil condition that results from tightly packing soil; compacted soil allows for only marginal aeration and root penetration.
COMPANION PLANTING: Planting garlic, marigolds, etc. along with other plants to discourage insect infestation.
COMPOST: A mixture of decaying organic material.
CONDITIONING: To soak rockwool in an acidic solution to lower pH from 8.0 to 5.5.
COPPER: This micronutrient is an internal catalyst and acts as an electron carrier; it is also believed to play a role in nitrogen fixation.
CORE: The transformer in the ballast is referred to as the core in HID lighting systems.
CORMS, RHIZOMES AND TUBERS: Dormant stems planted in the fall for spring blooms, or forced indoors for winter blooms. Common varieties are dahlias and irises.
COTYLEDON: Energy storage components of a seed that feed the plant before the emergence of its first true leaves.
CROSS-POLLINATE: Pollinating two plants having different ancestry.
CUBIC FOOT: Volume measurement in feet: L"XW"XH" divide by 1728"=CU.FT.
CUTTING: (1) Growing tip cut from a parent plant for asexual propagation (2) Clone.
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