CYLINDRICAL ARTICLE FOR USE IN CONTROLLING GROWTH OF TREE AND METHOD FOR CONTROLLING GROWTH OF TREE

摘要

A cylindrical article characterized as being manufactured of a material which cuts off red lights having a wave length of 560 to 700 nm with a greatest cutting percentage of 30 to 50 % and also cuts off 100 % of ultraviolet lights having a wave length of 400 nm or less; a cylindrical article characterized as being manufactured of a material which cuts off far-infrared lights having a wave length of 700 nm or more with a greatest cutting percentage of 50 to 80 % and also cuts off 100 % of ultraviolet lights having a wave length of 400 nm or less; a cylindrical article characterized as being manufactured of a material which cuts off blue lights having a wave length of 400 to 500 nm with a greatest cutting percentage of 30 to 80 % and also cuts off 100 % of ultraviolet lights having a wave length of 400 nm or less; and a method for controlling the growth of a tree.