2023, Vol. 8, Special Issue 3

During the kharif Season 2018–2019 period, a pot culture experiment with the title “A mixture of inorganic nitrogenous fertilizers and farmyard manure has an effect on the soil's pH, EC, organic carbon, BD, and porosity after rice is harvested”. Was conducted at Institute of Agricultural Sciences farm, Siksha ‘O’ Anusandhan University, Bhubaneswar Odisha. On Sandy loam soil. The experiment consisted of eight treatments viz. T₁-Control, T₂- 50% RDF, T₃-50% RDF + FYM @ 5t ha^-1, T₄-75% RDF, T5-75% RDF + FYM @ 5t ha^-1, T₆- 100% RDF (NPK 80:40:40), T₇-100% RDF + FYM @ 5t ha-1 and T₈-150% RDF. The experiment was laid out in a Randomized Block Design with three replications. The results on organic carbon content showed that T₇ (100% RDF + FYM @ 5 t ha^-1) had the greatest organic carbon content (7.43 g kg^-1) and T₁ had the lowest (5.43 g kg^-1). When compared quantitatively to inorganic and control treatments, use of organics (FYM) was determined to be better. Once the crop was harvested, the bulk density of the soil varied between 1.45 and 1.57 g cm³ depending on the treatment. Under all treatments, the bulk density of soil was discovered to be lower than the initial (1.58 g cm³) value, although there was no difference. Non-significant differences were seen across all treatments. After the crop was harvested, the EC of the soil varied from 0.48 to 0.56 dSm^-1. All treatments resulted in a reduction in electrical conductivity from the starting point. The combined application of organic (FYM) and inorganic fertilizers in this study had significant effect on total porosity. The highest total porosity (45.28%) was obtained from the application of 5 t FYM ha^-1 in combination with 100% RDF inorganic fertilizer followed by treatment T₅ (75% RDF +5 t FYM ha^-1) with 44.15% porosity.