Effect of the application of alkaline FA in conjunction with NPK fertilizers and FYM on physico chemical properties of acidic soil

A field experiment was carried out in the year 2022 in Kharif season to study the effect of application of alkaline fly ash (FA) in conjunction with NPK fertilizers and farm yard manure (FYM) on the physico - chemical properties of soil. The crop grown was rice cv. Pooja. It was observed that the porosity increased in all the treatments and the highest value was 53.58% in the plot receiving 50% RD + 40t FA ha-1 + 10t FYM ha-1. Bulk density decreased with higher doses of fly ash and was lowest in the plot receiving 50% RD + 40t FA ha-1 + 10t FYM ha-1. Water holding capacity increased in all the treatments except the one receiving only NPK fertilizers (control). It increased with increase in the dose of fly ash and registered highest values in FYM treated plots. pH also registered higher values all the treatments and increased with the dose of fly ash. Electrical conductivity and organic carbon increased in all the treatments over the experimental soil and recorded highest values in the FYM treated soil. The macro nutrients N, P and K also increased over the experimental soil and registered highest values in the FYM treated soil with higher dose of fly ash.