AGRICULTURAL CHEMICAL OR AGRICULTURAL CHEMICAL-ORIGINATED GAS CONCENTRATION DETECTION METHOD

PROBLEM TO BE SOLVED: To provide a method capable of accurately recognizing the safety of a sprayed region by detecting agricultural chemicals concentration or agricultural chemicals-originated gas concentration in the air after agricultural chemicals spray with a simple facility constitution. SOLUTION: A predetermined optical path is set in agricultural chemicals sprayed field after the agricultural chemicals spray, infrared light is projected and received using an analyzer 1, and the received light data is output to a computer 10 connected to the analyzer 1 and is spectrally analyzed by the computer 10. One or a plurality of reflectors 5 are disposed in a predetermined optical path, it is determined that the agricultural chemicals concentration is disposed at which concentration level, of a plurality of stages of concentration levels, and an alarm device 14 makes an announcement when the agricultural chemicals concentration is a set value or more. Also when the agricultural chemicals sprayed paddy field is set as an housed paddy field, detection is allowed with a similar constitution. The reflector 5 disposed in the housed paddy field is disposed attachably/detachably on the wall in the house. COPYRIGHT: (C)2008,JPO&INPIT