Interaction effects of irrigation by municipal wastewater and inorganic fertilisers on wheat cultivation in Bangladesh

The interaction effects of five irrigation water qualities formed with municipal wastewater (hereafter called wastewater) and two inorganic fertiliser levels on the growth and yield of wheat (Triticum aestivum L. cv Shatabdi) were explored in three consecutive growing seasons during 2007–2010. The experiment was set in a split-plot design with two factors and three replications. The five irrigation treatments – I1: freshwater (groundwater extracted by tubewell) as control, I2–I4: diluted wastewater (having wastewater fraction of 0.25, 0.50 and 0.75, respectively) and I5: raw/undiluted wastewater – were allocated to the main plots, and the two fertiliser levels – F0: no fertiliser and F1: recommended standard dose – were allocated to the sub-plots. The wastewater contained nitrogen (N), phosphorus (P) and potassium…