Relationship between the content of expansible 2:1 type clay minerals in paddy soils and the amount of ammonium nitrogen in the ponding water by a laboratory experiment

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概要

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• From the viewpoint of ammonium-nitrogen (N) transportation from paddy fields to rivers, estimation of ammonium-N in the ponding water is important for soil management to reduce N outflow from paddy fields. The relationship between the content of expansible 2:1 type clay minerals (i.e. smectite and vermiculite) and the amount of ammonium-N in the ponding water was investigated by a laboratory incubation experiment. Eighteen soils including fifteen alluvial soils and three volcanic ash soils from northeastern Japan were used; the clay content in soils was 116-476g kg^<-1>; the content of expansible 2:1 type clay minerals in soils was 0-395g kg^<-1>. The experimental condition corresponded to the condition of paddy fields just before transplanting, where readily available N fertilizer was incorporated to plow layers (0.15m) at a rate 5g N m^<-2> as basal fertilizer and submerged water depth was 0.06m. The concentration and the amount of ammonium-N in the ponding water was 1.4-7.5mg L^<-1> and 0.08-0.45g m^<-2>. The amount of ammonium-N significantly related to the amount of clay in the calculated plow layer with a depth of 0.15m (R^2=0.42). On the other hand, the amount of expansible 2:1 type clay minerals in the calculated plow layer more strongly related to ammonium-N than the amount of clay (R^2=0.55). These results were attributed to the fact that expansible 2:1 type clay minerals have larger amount of negative charge site per clay and higher selectivity in ammonium adsorption than other clay minerals. From these results it was considered that paddy soils rich in clay fraction or expansible 2:1 type clay minerals could adsorb larger ammonium and mitigate ammonium-N runoff through the ponding water.Original Paper

• 東北大学の論文

著者

• Saigusa Masahiko

  Field Science Center, Graduate School of Agricultural Science, Tohoku University

• Saigusa Masahiko

  Field Science Center Graduate School Of Agricultural Science Tohoku University:(present Office)toyoh

• Saigusa Masahiko

  Field Sci. Center Graduate School Of Agric. Sci. Tohoku Univ.

• ITO Toyoaki

  Field Science Center, Graduate School of Agricultural Science, Tohoku University

• SANO Oki

  Field Science Center, Graduate School of Agricultural Science, Tohoku University

• Sano Oki

  Field Science Center Graduate School Of Agricultural Science Tohoku University

• Ito Toyoaki

  Field Science Center Graduate School Of Agricultural Science Tohoku University

• Saigusa Masahiko

  Field Science Center Graduate School Of Agricultural Science:toyohashi University Of Technology

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