Effects of available nitrogen and ammonium adsorption of plow layer on nitrogen uptake and yield of paddy rice (Oryza sativa L.)
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概要
- 論文の詳細を見る
Effects of available nitrogen (N) and ammonium adsorption of plow layer (PL) on N uptake and brown rice yield were investigated for seven soils. The experiment was conducted in a single paddy field under same conditions except for soils. Rice plants were grown in frames, which the seven different soils (four alluvial paddy soils and three andic paddy soils) were repacked. Not only a small percolation condition (i.e. original subsoil (OS) plot) but also an increased percolation condition was treated by the replacement of subsoil with sand (i.e. sandy subsoil (SS) plot). Percolation rate was lower in clayey smectitic (1-2mm day^<-1>) than in sandy and andic (5-9mm day^<-1>) soils in the SS plots. In the OS plots, percentage of exchangeable ammonium-N in total soil ammonium N was 89-96% in all soils at 11 days after transplanting (DAT), and was higher in soils with the large ammonium adsorption of PL. Soil ammonium-N at 40 DAT (i.e. at active-tillering stage), N uptake at harvest and brown rice yield were explained by the available N of PL in the OS plots. It is considered that the difference of ammonium adsorption of PL did not strongly affect them, because of its small variation and the small percolation. In the SS plots, the soil ammonium-N at 40 DAT was explained by the ammonium adsorption and the available N of PL. It is considered that soil ammonium-N was much protected from leaching and denitrification in soils with the large ammonium adsorption of PL. However, the total N uptake and the brown rice yield were effectively explained by the available N of PL, and the ammonium adsorption of PL was not selected as an important parameter. It is considered that the ammonium adsorption of PL did not strongly affect the N uptake after maximum tillering stage. The ammonium adsorption of PL did not significantly related to recovery rate of fertilizer N both in the OS and SS plots because of the small variation in the ammonium adsorption of PL among soils.Original Paper
- 東北大学の論文
著者
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Saigusa Masahiko
Field Science Center, Graduate School of Agricultural Science, Tohoku University
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Saigusa Masahiko
Field Science Center Graduate School Of Agricultural Science Tohoku University:(present Office)toyoh
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Saigusa Masahiko
Field Sci. Center Graduate School Of Agric. Sci. Tohoku Univ.
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ITO Toyoaki
Field Science Center, Graduate School of Agricultural Science, Tohoku University
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SANO Oki
Field Science Center, Graduate School of Agricultural Science, Tohoku University
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Sano Oki
Field Science Center Graduate School Of Agricultural Science Tohoku University
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Ito Toyoaki
Field Science Center Graduate School Of Agricultural Science Tohoku University
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Saigusa Masahiko
Field Science Center Graduate School Of Agricultural Science:toyohashi University Of Technology
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