PURPOSE: To make it possible to sprinkle a chemical liquid in a mist like ultrafine particle form, by a method wherein a nozzle capable of forming desired ultrafine particles by compressed air from a small volume and high compression type compressor is used and a prime mover, a commpressor and a chemcial liquid tank are mounted on a back carrying frame.

CONSTITUTION: A prime mover 4, a small volume and high compression type compressor 5 driven by said prime mover 4 and a chemcial liquid tank 7 receiving a chemical liquid are mounted to a back carrying type frame 1 as well as one end of a pipe 8 capable of flowing a small volume of highly compressed air is connected to the emitting port of the compressor 5. To the othe end of the pipe 8, a nozzle body 10 having a compressed air flow passage communicated with the pipe 8 and a chemical liquid flow passage comminucated with the tank 7 is mounted as well as constituted so as to sprinkle the chemical liquid agent in a mist like ultrafine particle form by highly compressed air. That is, the chemical liquid agent can be uniformly adhered to crops without sprinkling irregularity in spite of small amount sprinkling as well as control work with high control effect can be carried out to crops of equipment horticulture as well as raising outdoors.