Tuesday, November 6, 2007
164-13

Effects of Water Table Control by FOEAS on Soybean Productivity in Paddy Fields.

Shinji Shimada, JAPAN,Natl.Ag.Res.Ctr., National Agricultural Research Center, 3-1-1-, Kamnondai, Tsukuba, IBARAKI 305-8666, JAPAN and Shinsaku Fujimori, National Institute for Rural Engineering, 2-1-6 Kannondai, Tsukuba, 305-8609, Japan.

Soybean productivity in Japan is low and not stable as the most of soybeans are cultivated in drained paddy fields, where both wet injury and drought frequently occurred. It was developed a new water table control system (FOEAS) for relieving both wet injury and drought in paddy fields in Japan. We cultivated soybean plants on the heavy soil paddy field with controlling the water table at 40cm, 32cm or 20cm below the soil surface compared with a sloped field or open ditch drainage plot. It was revealed that controlling water table by FOEAS is beneficial for soybean production. The seeds emergence was improved, and photosynthesis and nodule nitrogen fixation were increased with controlling water table depth by FOEAS resulted in 20% higher yield even in very low fertility of the soil. The Outline of FOEAS system and its effects on soybean production will be discussed.     

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