Influence of a Percolation Pattern on the Cadmium Concentration, the Growth and the Yield of Rice Plants in Cadmium Polluted Paddy Fields with Soil Dressing

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  • 客土をもつカドミウム汚染水田の浸透型が稲体のカドミウム濃度および生育収量に及ぼす影響
  • キャクド オ モツ カドミウム オセン スイデン ノ シントウガタ ガ イネタイ ノ カドミウム ノウド オヨビ セイイク シュウリョウ ニ オヨボス エイキョウ

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We investigated that the cadmium concentrations, the growth and the yields of the rice plants by using two models of stratified paddy fields during three years. The first model had water flow in an open system at the plowsol(length:10.0cm) became oxidation layers. The other model had water flow in a closed system at the plowsol became reduction layer. The plow layer(length:12.5cm) made of soil dressing that did not polluted soil. But the plowsol in those models was made of polluted soil (3.39mg/kg) that existed in polluted paddy field.<br>As a result, the range of cadmium concentration in both models in brown rice, stems and leaves was 0.000-0.2000mg/kg, 0.050-0.845mg/kg, respectively. Also the one in roots in the plow layers and that in the plowsoles were 1.760-4.440 mg/kg, 5.170-12.73mg/kg, respectively. Cadmium concentration in every item with water flow in an open system became higher than that with water flow in a closed system. We realized that percolation patterns did not influence the growth of rice plants. But the number of panicles and the weight of the brown rice with water flow in the closed system became higher than those with the water flow in the open system.<br>Above those result, it was clear that percolation pattern influence on the concentration of cadmium in the rice plant, the growth and the yields under inundation during the cultivation with stratified models that have soil dressing.

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