APPLICATION OF INTEGRATED SORALIMETER FILMS FOR MEASURING RADIATION INTERCEPTION IN CROP COMMUNITIES

Akihiro ISODA, Takao YOSHIMURA*, Toshio ISHIKAWA*, Hiroshi NOJIMA and Yasuo TAKASAKI(Faculty of Horticulture, Chiba University, Matsudo-city, Chiba 2 7l, Japan ; *Remote Sensing and Image Research Center, Chiba University, Inage-ku, Chiba-city, Chiba 263, Japan)

Integrated solarimeter films have been developed by Yoshimura et al.(1990). These are pieces of film and measures radiation by the dye fading ratio, after exposure to radiation. This sensor has several advantages compared with the usual measuring instruments; a) requires no electric power, b) cheap and mass-production easily, c) suitable to integrate solar radiation for a few days, d) easy to work outdoors, e) easy to use on leaf surface because of this small size and light weight and f) the possibility of measuring many points at the same time. We used this film for radiation interception characteristics in rice and soybean. Relationship between plant type and radiation interception were examined for varietal differences.