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The availability and use efficiency of phosphorus (P) is low in the acidic Ganges delta floodplain soils. The aim of the present study was to increase the use efficiency of P by varying the methods and forms of P application. The experiment comprised a factorial combination of two methods (broadcasting and furrow placement) and two forms (granular and powder) with three rates of P fertilizer application (36, 48 and 60 kg P ha −1 ). Results showed that furrow placement of P application gave 10%–20% yield benefit over broadcasting method. Agronomic P use efficiency, partial factor productivity, economic efficiency and leaf P concentration were remarkably higher in furrow placement of P fertilizer than conventional broadcasting method. Numerically the application of powder form P fertilizer demonstrated higher yield compared to granular form of P application. The furrow placement of P fertilizer exhibited the higher yield at lower rate of P application (36–48 kg P ha −1 ) while opposite trends were observed for broadcasting. Thus, it is concluded that furrow placement of P fertilizer application at 36–48 kg ha −1 would give the best grain yield of maize in the Ganges delta floodplain soils.

Increasing the use efficiency of fertilizer phosphorus for maize in low-P Ganges Delta soils