Quantity-Intensity Relationship for Characterizing Ammonium Chemistry of Bangladesh Soils in Reference to Clay Mineralogy

概要

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Ammonium chemistry in surface soils collected from major soil series of Bangladesh was studied in terms of quantity-intensity (Q/I) relationship. Soils were classified according to physiography and parent materials; calcareous floodplain soils were dominated by mica and smeetite, while noncalcareous floodplain soils, terrace soils, and hill soils were dominated by mica or kaolinite and lacked smeetite as a major clay mineral. Different Q/I parameters were obtained between soils of smeetitie and non-smeetitie types. Soils of smeetitie ratio at a low and fixed level. The content of labile ammonium was high and estimated to increase with increasing addition of NH_4^+. In contrast, soils of non-smeetitie type with a low potential buffering capacity showed a considerable variation of both the equilibrium activity ratio and labile ammonium content, as affected by the application of NH_4^+. Based on the ammonium chemistry, expected N-fertilizer application was compared with the prevailing application method.
社団法人日本土壌肥料学会の論文