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- secondary phloemphloem produced to the exterior of the vascular cambium during secondary growth.
- secondary rootSee lateral root
- secondary (secondary line)in an electric utility system. a lower-voltage (generally 110 to 750 volts) electric supply line that carries electricity from distribution transformers to service lines.
- secondary xylemxylem produced to the interior of the vascular cambium during secondary growth.
- secured footlockmethod of footlocking in which the climber utilizes an additional means of securing against a fall. such as with a Prusik hitch (see footlock and Prusik hitch).
- seedthe fertilized. ripened ovule of a flowering plant found in the embryo. seed leaf
- seedlingsmall plant newly born from a seed.
- selective herbicideHerbicides that are toxic primarily to the target pest (and perhaps a few related species). leaving most other organisms. including natural enemies. unharmed
- selective herbicidesherbicides that are effective only on specific plant types (e.g.. broadleaves. grasses) or species.
- selective managementmethods used to target undesirable vegetation while retaining desirable vegetation.
- semi ring-porouspattern of wood development displaying characteristics of both ring-porous and diffuse-porous woody plants.
- senescenceprocess of aging. Process preceding leaf drop in deciduous plants.
- serpentine soilsoil derived from serpentine parent rock material that has high levels of nickel (Ni). chromium (Cr). and magnesium (Mg) and low levels of calcium (Ca). available magnesium (Mg). and available major plant nutrients.
- serratesaw-tooth margin of a leaf. with the teeth pointed forward (compare to dentate).
- service lines (service drops)in an electric utility system. a lower-voltage (generally 110 to 750 volts) electric supply line that carries electricity from secondary distribution supply lines to end user premises.
- shackleU-shaped fitting with a pin running through it. Clevis.
- shakeseparation of wood at the growth rings or rays. usually along the barrier zone that forms in the compartmentalization process (CODIT). Ring shake(s). Radial shake(s).
- shake(s)separation of wood at the growth rings or rays. usually along the barrier zone that forms in the compartmentalization process (CODIT). Ring shake(s). Radial shake(s).
- shankthe straight rod portion of a climbing spike which straps to the climber's inner leg.
- shavingremoving the entire outside periphery (sometimes including the bottom) of a container root ball.
- shear1) n. in mechanics. the movement or failure of materials. especially laminar material such as wood by sliding side by side. 2) n. a tool used to cut small diameter pJan.t material. including secateurs and snips. as well as long-bladed hand tools and power tools used to cut hedges. 3) v. to(...)
- sheaveinner fitting within a block or pulley over which the rope runs.
- sheepshankknot used to form a loop in the middle of a line or to shorten a line.
- sheet bendknot used to attach two lines. The lines can be of unequal diameter. Not to be used for life support.
- ship augertype of drill bit with an open spiral
- shock-loadingdynamic. sudden force placed on a rope or rigging apparatus when a moving load or piece is stopped.
- shootnew stem or branch growth on a plant.
- shruba woody plant. generally smaller than a tree. typically with multi pi stems branching from or near the ground.
- SIAstatics integrated assessment
- sideflashphenomenon of a lightning strike leaving its current path and jumping" to reach a better-grounded conductor. "
- sieve cellslong. slender phloem cells in gymnosperms.
- sieve tube elementsspecialized phloem cells involved in photosynthate transport. Exist only in angiosperms.
- signphysical evidence of a causal agent (e.g.. insect eggs. borer hole. frass) (contrast with symptom).
- siltsoil particles with a grain size between 0.004 mm and 0.062 mm (coarser than clay particles but finer than sand) (contrast with clay and sand).
- silviculturestudy and practice of the maintenance and growth of forests.
- SIMstatics integrated method
- simple leafsingle-bladed leaf. Not composed of leaflets (contrast with compound leaf).
- single actionpertaining to carabiners and snaps. requiring one motion for the gate to open. A nonlocking carabiner is single action.
- single rope technique (SRT)a climbing system utilizing a rope pulled over a high anchor. with the running end anchored and the climber utilizing the standing part (contrast with DdRT and DRT).
- sinkplant part that uses or stores more energy than it produces (contrast with source).
- sinker rootsdownward-growing roots that provide anchorage and take up water and minerals. Especially useful during periods of drought.
- sinusspace between two Jobes of a leaf (contrast with lobe).
- site analysis1) consideration or evaluation of the conditions. restrictions. and environment of a planting site. 2) consideration or evaluation of a construction or development site requiring a tree conservation or preservation plan. 3) consideration during a tree risk assessment.
- site considerationsfactors that must be taken into account when assessing a site for planting. tree conservation. preservation. or for any operation.
- skeletonizedleaf-feeding damage caused by insects (skeletonizers). characterized by the loss of tissue between the leaf veins.
- skinningprocess of removing old leaf bases from palms. Often done for aesthetic purposes. Also called peeling.
- skirtdead or dying palm fronds gathered down the stem of a palm. which may be removed for aesthetic or safety reasons.
- slack tenderany of several devices used to facilitate taking up slack in the climbing line.
- slashnon-standing debris less than 6 in (15 mm) in diameter left after right-of-way clearing operations.
- slingdevice used in rigging to attach. connect or secure equipment or pieces being rigged.