Identification manner of plantation nursery stock such as cedar and the device null which is used for

摘要

PURPOSE: To facilitate the operation to cut weeds, etc., growing thick around a nursery stock such as a Japanese cedar planted in a cut-over area in the course of its growth ;CONSTITUTION: Magnets 2 are buried in the ground around a planted nursery stock 1 and a sensor 7 for sensing the magnetism of the magnets is assembled in a bush cutter 3. Thereby, the approach of blades in the bush cutter to the planted nursery stock during the bush cutting operation is warned to an operator to prevent erroneous cutting from occurring.;COPYRIGHT: (C)1993,JPO&Japio