Section 6. Noxious weed management trust fund. (1) The legislature shall provide for a fund, to be known as the noxious weed management trust of the state of Montana, to be funded as provided by law.

(2) The principal of the noxious weed management trust fund shall forever remain inviolate in an amount of ten million dollars ($10,000,000) unless appropriated by vote of three-fourths (3/4) of the members of each house of the legislature.

(3) The interest and income generated from the noxious weed management trust fund may be appropriated by a majority vote of each house of the legislature. Appropriations of the interest and income shall be used only to fund the noxious weed management program, as provided by law.

(4) The principal of the noxious weed management trust fund in excess of ten million dollars ($10,000,000) may be appropriated by a majority vote of each house of the legislature. Appropriations of the principal in excess of ten million dollars ($10,000,000) shall be used only to fund the noxious weed management program, as provided by law.