Variation of Phosphorus Status in Soils of Ganges Floodplains, Bangladesh, Based on the Level of Decalcification (Soil Chemistry and Mineralogy)

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Phosphorus status of soils derived from calcareous sediments in the Ganges Floodplains, Bangladesh, was evaluated as a function of decalcification. Total P concentration of the soils ranged from 257 to 726 mg kg^<-1>, and inorganic P always predominated over organic P. In inorganic P, the amount and percentage of nonoccluded Ca-bound P (Ca-P) was higher for the decalcified horizons than for the horizons containing free carbonates, although more than half of inorganic P was occupied by occluded-P. Phosphorus availability, assessed by the Bray P-2 method, was high in the decalcified horizons while low in the horizons containing free carbonates, except for the oldest and noncalcareous soil. It was suggested that P availability in the soils of the Ganges Floodplains could be enhanced by decalcification after deposition of sediments.
社団法人日本土壌肥料学会の論文