A. 2007 Rice Experiment A rice field located near the National Academy of Agricultural Science experimental field (Latitude 37.2578, Longitude 126.9893) was studied in 2007. The paddy field was first flood, and then, the rice seedlings were transplanted on May 18. The size of the rice paddy field was 22×31 m, and rice seedlings were about 15 cm tall and were spaced 30 cm×15 cm apart at the time of transplanting. The peak biomass occurred on August 16 (heading stage), and the plants were harvested on October 11 (146 days after transplanting). It should be noted that the field was flooded during the entire experiment except during harvest. Photographs illustrating plant conditions are included in Fig. 1