The definitions of terms contained in chapter 173-400 WAC are incorporated into this chapter by reference. Unless a different meaning is clearly required by context, the following words and phrases as used in this chapter, shall have the following meanings:

(1) "Fluorides" means compounds of the element of fluorine.

(2) "Forage" means grasses, pasture and other vegetation that is consumed or is intended to be consumed by livestock.

(3) "Growing season" means April 1 to September 30 unless a different period is specified by the department by an order.

(4) "Injury" means any fluoride induced measurable change in a plant that is metabolic, visual, or physiological such as alterations in the assimilation rate of plant constituents, leaf necrosis, leaf or fruit abscission, or reduced or altered growth.

(5) "Damage" means any fluoride induced injury to a plant that causes economic loss, or would adversely impact the use and enjoyment of public land use areas.

(6) "Public land use area" means land belonging to the community as a whole and administered through its representatives in government, and within which fluoride sensitive vegetation is important to the purpose of the land use such as parks, national forests, etc.