Effect of Fertilizer and Manure on the Movement of NPKS in Rice Soils of Madhupur Tract and Meghna River Floodplain

The experiment was conducted in a net house of Sher-e-Bangla Agricultural University,(23°35'N latitude and 90°35'E longitude) Dhaka, Bangladesh during November - May to study the effect of fertilizer and manure on the yield of boro rice and movement of nutrients through undisturbed soil columns. The experiment consists of 2 factors, i.e. soils and fertilizer plus manure. Two soils (S1= SAU Soil and S2= Sonargaon Soil) with 4 levels of fertilizer plus manure, as T0: Control, T1: 100% N120P20K45S20 (Recommended dose), T2: 50% NPKS + 5 t ha−1 cowdung, T3: 50% NPKS + 2.1 t ha−1 poultry manure were imposed during boro (winter) season. Boro rice (BRRI dhan29) was grown in the soil cores, and fertilizer and manure treatments were applied to the soils. Higher and statistically similar grain yields of boro rice were found from T1, T2, and T3 fertilizer treatments. The highest grain yield was found where 50% NPKS + 5 t ha-1 cowdung were used in the Sonargaon soil. Higher grain N, P and K concentrations were obtained in the treatment combination where fertilizer plus manure were applied in two soils. Higher leachate N, P and K concentrations were found in 100% chemical fertilizer treatment. The N leaching increased up to 45 DAT and then declined while the P and K leaching increased up to 35 DAT and then decreased. Higher pH values were found in the 10-20cm depth of post-harvest soils in comparison to 0-10 cm. The higher pH values were found in soils where 50% NPKS + 2.1 t ha−1 poultry manure applied. The level of P more increased in the depths of 0-10 cm of SAU soil where fertilizer or fertilizer plus manure were applied and the P concentrations more increased in the depth of 10-20 cm where fertilizer plus manure were applied in SAU soil. The level of S more increased in the depths of 0-10 cm and 10-20 cm of S2T2 and S2T3 treatment combination where fertilizer plus manure applied in Sonargaon soil. Similar levels of N and K concentrations were observed in the initial and post-harvest soils.Bangladesh Agron. J. 2017, 20(2): 123-133