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.