Arboriculture Glossary of Terms
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- NAAnaphthalene acetic acid. National Arborist Association (now TCIA)
- NADFNational Arbor Day Foundation
- Nageia nagiNagi - Japanese Podocarpus
- Nandina domesticaNandina domestica
- NASFNational Association of State Foresters
- NATCCNorth American Tree Climbing Environmental Design Championship
- native speciesplants indigenous to a region. Naturally occurring and not introduced by humans (contrast with exotic species. i11trorlucerl species. and naturalized species).
- natural-crotch riggingrigging methods that utilize natural unions for the rigging points.
- natural enemypredator. parasite. or pathogen that targets an organism.
- natural pruningprocess of branch removal in which the pruning cuts are made at nodes and in relation to the positions of the branch collar and branch bark ridge.
- natural resource inventoryin urban forestry. an evaluation and cataloging of canopy cover. species composition. size distribution of trees in forest preserves. remnants. fragments. and other open spaces. Information on hydrologic. geologic. biologic. historic. or ecological features may be included.
- natural (target) pruningprocess of branch removal in which the pruning cuts are made at nodes and in relation to the positions of the branch collar and branch bark ridge.
- naturalized speciesnon-native species that has become established in a region and propagates without human assistance (compare to exotic species. introduced species. and native species).
- necrosislocalized death of tissue in a living organism.
- nematodemicroscopic roundworm. Many are beneficial organisms. but some feed on plant tissues and may cause disease or damage.
- Nepenthes rafflesianaNepenthes rafflesiana
- Nephrolepis biserrataNephrolepis biserrata
- Nephrolepis exaltataNephrolepis exaltata
- NESCNational Electrical Safety Code
- nitrogen oxidegaseous compound that results from the high temperatures in internal combustion engines. which in rum causes atmospheric nitrogen to combine with oxygen. Nitrogen oxide (N ) is one of the major components of acid rain.
- NJUGNational Joint Utilities Group
- nodeslightly enlarged growth point on a stem or branch where leaves and buds arise (contrast with i11tenwdc).
- noise attenuationreduction of sound levels.
- nomenclaturescientific naming system for living organisms. Scientific names are Latin (or Latinized fonns of other languages) and written in italics. the genus first (always starting with capital letter). followed by the specific epithet (species. always starting with lowercase letter. e.g.. Quercus alba).
- nonconductive (nonconducting)a material property not capable of conducting heat or electricity (see dielectric).
- noninfectiousdisorders that are not caused by a pathogen and cannot be passed from one host to another.
- nonselective herbicideHerbicide that is phytotoxic to all or most of the plants it comes in contact with
- nontarget organisman organism that is not intended to be damaged or killed by a pesticide but that may still be susceptible to its effects.
- notchwedge cut into a log or tree for felling.
- notch gatein carabiners. a type of gate latch mechanism. Also called pin lock or tooth lock. Has the disadvantage that it may catch on a rope (contrast with kelj lock).
- noxioushandful. injurious. detrimental. or undesirable.
- NPTCNational Proficiency Test Council
- NTTNational Tree Trust
- NUFUNational Urban Forestry Unit
- nursery stockplant obtained from or grown in a nursery and intended to be planted out in the landscape.
- nut1) a dry. hard. one-seeded fruit. 2) hardware with internal threads matched to the external threads oaf bolt.
- nutrienta substance that provides nourishment essential for the growth and maintenance of life; in plants. often used synonymously with essential element.
- nutrient cyclingmovement of mineral elements (sometimes called nutrients) within an ecosystem as organic matter decomposes. releasing bound nutrients back to plants.
- nutrient deficiencya condition in which the supply or availability of an essential element results in cessation of critical plant processes. resulting in visible. physical symptoms such as chlorotic leaves or necrotic margins. and which. if left untreated. will reduce tree health and may eventually lead to premature death.
- nutrient limitationa condition in which the supply or availability of an essential element reduces the growth rate but does not cause plant dysfunction or premature death.
- nymphimmature form of an insect with incomplete development. resembling a smaller version of the adult without wings.
- NZ/AS4360risk management standard in Australia and New Zealand.