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***Test of a Groundwater Level Control Scheme for Higher Soybean Yield
in Multi-purpose Paddy Fields
Shou MURAKAMI*, Choichi SASAKI** and Takeyuki ANNAKA**** Akita Agriculture, Forestry and Fisheries Research Center, Agricultural Experiment Station,-.ῌ+ Genpachizawa, Aikawa, Yuwa, Akita, Akita, *+*ῌ+,-+, Japan** Faculty of Agriculture and Life Science, Hirosaki University,- Bunkyo-cho, Hirosaki, Aomori, *-0ῌ2/0+, Japan*** Faculty of Agriculture, Yamagata University,+ῌ,- Wakaba-machi, Tsuruoka, Yamagata, 331ῌ2///, Japan
Abstract
In this study, we examined a groundwater control scheme to increase soybean yield in multipurpose paddy ﬁelds.

In a multi-purpose paddy ﬁeld with a box connecting the irrigation canalto underdrain system and a ﬂexible overﬂow relief well (denoted “the experimental plot”), thegroundwater level was aimed to keep at +* cm below the soil surface of the ﬁeld during the blossom and maximum luxuriance stages, i.e. in August when much water is required for soybean
growth.

On the other hand, in another multi-purpose paddy ﬁeld with a horizontal relief well(denoted “the conventional plot”), the outlet of the relief well was kept at 2* cm below the soil
surface and was always opened.

The study was conducted for two years on these plots. The

actual groundwater level in the ﬁeld, soil water content in the topsoil and the soybean yield were
measured.

In the ﬁrst year, the actual groundwater level in the experimental plot in August was

kept higher (+-..

/.* cm below the soil surface) as compared to that in the conventional plot (,,.3

1./ cm). Soybean yield in the former was ,/῍ higher than that in the latter, indicating thee#ect of the groundwater level control scheme.

In the second year, the actual groundwater levelin the experimental plot in September was kept higher (from -* to .* cm below the soil surface) as
compared to that in the conventional plot (from 0* to 1* cm), and soybean yield in the former was+0῍ higher than that in the latter. Hydraulic conductivity in the plow layer and subsoil was
found to become higher through the soybean cultivation. These results showed the possibility ofhigher yield in the soybean cultivation in multi-purpose paddy ﬁelds by adapting the groundwater level control scheme.

It was also suggested that the groundwater level should be managed

properly throughout the year to maintain low permeability of the subsoil.
Key words : Soybean, ﬂexible overﬂow relief well, multi-purpose paddy ﬁeld, blossom stages,
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