Development of the virtual paddy field system for researching a light-interception efficiency of a rice plant
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We developed a paddy field model “the virtual paddy field system” for researching a highyielding
cultivation method and a strategy of rice breeding. The electromagnetic 3-D digitizer was used to
obtain the structure of a rice plant. The three dimensional coordinates of nine points on the edge of each leaf
were measured with this equipment and the spatial arrangement of leaves of one plant was assembled. Using
the detailed solid structure of a single plant, the three dimensional model of paddy field that consists of
some rice plants was constructed and the program for evaluating a light-interception efficiency of paddy
field was made. This system calculates the area of leaves receiving direct sunlight and the percentage of
irradiated leaf area to total leaf area of single plant inside a paddy field at any angle of elevation and any
azimuth angle of the sun. It can also evaluate the light-interception efficiency of virtual paddy field that
consists of rice plants of which leaf length, leaf angle, internode length or leaf shape, was changed. And it
can also be applied to the virtual paddy field with any planting distance. By repeating these simulation
experiments, we will be able to recognize the ideal plant structure and the adequate cultivation method for
high-yielding. Our virtual paddy field system is useful for high-yielding rice cultivation and rice breeding.