Omara, PeterAula, LawrenceOtim, FredObia, AlfredBigatao Souza, Joao L.2022-12-052022-12-052022Omara, P., Aula, L., Otim, F., Obia, A., Souza, J. L. B., & Arnall, D. B. (2022). Biochar Applied with Inorganic Nitrogen Improves Soil Carbon, Nitrate and Ammonium Content of a Sandy Loam Temperate Soil. Nitrogen, 3(1), 90-100.https://www.mdpi.com/1512124https://nru.uncst.go.ug/handle/123456789/5870Biochar is suggested to improve soil properties. However, its combination with inorganic nitrogen (N) fertilizer in temperate soils is not well understood. This study compared the effect of fertilizer N-biochar-combinations (NBC) and fertilizer-N (FN) on total soil N (TSN), soil organic carbon (SOC), soil nitrate (NO3 􀀀–N), and ammonium (NH4 +–N). Soil samples were taken from experiments at Efaw and Lake Carl Blackwell (LCB), Oklahoma, USA with ten treatments consisting of three N rates (50, 100, and 150 kg N ha􀀀1) and three biochar rates (5, 10, and 15 t ha􀀀1). Results at Efaw showed greater TSN and SOC under NBC compared to FN by 3 and 21%, respectively. No percentage difference was observed for NH4 +–N while NO3 􀀀–N was lower by 7%. At LCB, TSN, SOC, NO3 􀀀–N, and NH4 +–N were higher under NBC by 5, 18, 24, and 10%, respectively, compared to FN. Whereas application of biochar improved SOC at both sites, NO3 􀀀–N and NH4 +–N were only significant at LCB site with a sandy loam soil but not at Efaw with silty clay loam. Therefore, biochar applied in combination with inorganic N can improve N availability with potential to increase crop N uptake on coarse textured soils.enbiochartotal nitrogennitrateammoniumsoil organic carbonArticle