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- W367834492 abstract "Eighteen widely distributed paddy soils from Northern, Northeastern, Central Plain and Eastern parts of Thailand were studied. Smectite is a dominant mineral in the clay fraction of soils in the Central Plain whereas soils in Northern, Northeastern and Eastern Thailand are kaolinitic and have none to moderate smectite contents. Therefore, of eighteen soils, four soils from Central Plain were selected for a detailed study of smectite. Crack structure dominates the morphology of smectite-rich soils whereas illite and kaolinite paddy soils have a massive fabric. Microprobe analysis shows that chemical composition of the clay matrix of smectite-rich soils corresponds to beidellite. The dioctahedral smectite in four smectite-rich paddy soils was investigated in detail. The swelling behavior of heated Li-saturated smectites demonstrated that the smectites are beidellitic. The layer charge of the smectites was estimated from the monolayer to bilayer transition on exchange with n-alkylammonium ions and ranges from 0.31 to 0.38 charge units per half unit cell formula. The structural formula of a calcium saturated soil smectite is: (Ca0.38K0.01)(Si6.83Al1.17)(Al3.20Fe 3+ 0.80Fe 2+ 0.01Mg0.19)O20(OH)4. This finding on beidellite in Thai paddy soils enhances basic knowledge required for optimizing paddy soil fertilizer management practices." @default.
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- W367834492 date "2007-01-01" @default.
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- W367834492 title "Smectite in Selected Thai Paddy Soils" @default.
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