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J. Jpn. Soc. Soil Phys.

No. +*+, p. +1῍,0 ῎,**/῏
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Pongpattanasiri SUKTHAI*ῌ*ῌ *ῌ**ῌ*Inﬂuence of a Percolation Pattern on the Removal of Soluble Elememts
in Downward Water and Rice Plant with Models of
Cadmium Polluted Paddy Fields
Pongpattanasiri SUKTHAI*, Choichi SASAKI*, Nobuhiko MATUYAMA*,
Kaori NODA** and Akio TONOUTI** Faculty of Agriculture and Life Science, Hirosaki University,- Bunkyo-cho, Hirosaki-shi, Aomori *-0ῌ2/0+, Japan** Faculty of Science and Thechnology, Hirosaki University,- Bunkyo-cho, Hirosaki-shi, Aomori *-0ῌ2/0+, Japan
Abstract
We investigated the inﬂuence of the percolation pattern on the removal of soluble elements and rice
plant under inundation during the cultivation with models of strati-ﬁed layers of cadmium polluted
paddy ﬁelds. At that models, plow layer and plowsole consisted of cadmium polluted soil but gravel
ﬁlled subsoil is not polluted. These models had di#erent percolation pattern in the plowsole andsubsoil. In the closed system model, every layer had water ﬂow in a closed system while the open
system model had water ﬂow in an open system in plosole and subsoil over the groundwater.
The following results were obtained. At low groundwater levels, plow sole and subsoil overthe groundwater had water ﬂow an open system and hence oxidized layers.

On the contrary, athigh groundwater level, every layer had water ﬂow in a closed system and hence reduced layers.
The electrical conductivity values of water ﬂow in a closed system were larger than those inwater ﬂow in an open system.

In the same way, concentrations of iron, calcium and manganese

in water ﬂow in a closed system became larger than those in water ﬂow in an open system.

Plantheight, number of stems and dry matter weight of rice plants under the closed system model arelarger than those of open system model. But no signiﬁcant di#erence is recognizedwhile considering leaf age and heading. The total weight of grains and ﬁlled grain ratio of rice plants underclosed system treatment were better than those in open system.
plants under both the models were about 0* cm.

The root elongation depth ofCadmium concentration in the brown rice ofplants grown under open system models are about ten times higher than that of plants grownunder closed system.
The above results made it clear that under inundation conditions during the cultivation period,
the removal of the soluble elements, concentration of cadmium in brownrice, growth and yield ofrice plant were a#ected by the percolation patterns.
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Key words : Model of polluted paddy ﬁeld with cadmium, Growth and yield of rice plant,
Concentration of cadmium in the brown rice, percolation pattern+ <- j   S ῌ 
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in downward water using a stratiﬁed paddy ﬁeld+-3.

model, PROCEEDINGS OF THE XIV MEMORI-

Jiangou Liu, Kunquan Li, Jiankuan Xu, Jiansheng
Liang, Xiaolog Lu, Jianchang Yang and Qingsen
Zhu (,**-) : Interaction of Cd and ﬁve mineral
nutrients for uptake and accumulation in di#erent rice cultivars and genotypes, Field crops research, 2- (-) : ,1+ῌ,2+.
Kohnke, H (+302) : Soil Physics, p. 01, McGraw-Hill
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