ice damage.  Breakage of tops and branches and stripping of branches and needles by an ice storm.
          ignite.  To set fire to, cause to burn. increment. An increase in the diameter, basal area, height, volume, quality, or value of individual trees or stands over time.
          increment borer.  A tool used to extract a core of wood from a tree, allowing study of the radial growth of a tree without felling it.
          increment core.  That part of the cross section of a tree extracted by an increment borer. Used to determine tree age and growth.
          insecticides.  Chemicals used to kill insects.
          intermediate trees.  Trees shorter than those in the dominant or codominant classes, but with crowns either below or extending into the crown cover formed by codominant and dominant trees; receiving a little direct light from above, but none from the sides; usually with small crowns, considerably crowded on the sides. See crown class.
          interplant.  To plant seedlings among existing trees, planted or natural.

K

          kerf, saw.  Width of a cut made by a saw.
          kiln, dry.  A structure heated by gas, steam, or electricity, in which lumber is dried under controlled conditions to a desired moisture content.
          knot.  That part of a branch that has been incorporated into the main stem.

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