Elemental Status Upon Continuous Application of Fly Ash in Conjunction with NPK Fertilizers and FYM of Rice (Oryza Sativa)

Abstract

A field experiment was conducted in the year 2023 and 2024 during the Kharif seasons at the Regional Research and Technology Transfer Station (RRTTS), Odisha University of Agriculture (OUAT), Bhubaneswar, Odisha to study the effect of cumulative application of fly ash (FA) in conjunction with other chemical fertilizers (CF) and farm yard manure (FYM) on the elemental status of rice (Oryza Sativa) cv. ‘Pooja’. It was observed that the macronutrient N in 2023 varied from 1.34% to 1.54% and decreased in 2024 from 1.23% to 1.41%. P varied from 0.26% to 0.35% in 2023 and from 0.26 to 0.36% in 2024 where as K content varied from 0.49% to 0.56% in 2023 and from 0.50% to 0.61% in 2024. In 2023, the micronutrient Fe varied from 70.11 ppm to 71.00 ppm and from 68.15 ppm to 72.13 ppm in 2024. Except the treatments receiving 50% RD and 40tFA/ha and with FYM, Fe content recorded a decrease in the year 2024. In case of Mn, it varied from 51.12 ppm to 54.02 ppm in 2023 and from 53.13 ppm to 55.70 ppm in 2024. Except the treatments receiving RD +40tFA/ ha, 50 % RD + 20tFA/ ha and with FYM, all the treatments showed a decreasing trend in the succeeding year. Zn varied from 33.71 ppm to 35.89 ppm in 2023 and from 34.01 ppm to 36.18 ppm in 2024. It increased in all the treatments in 2024 except the dose receiving 40tFA/ ha.