Biochar Applied with Inorganic Nitrogen Improves Soil Carbon, Nitrate and Ammonium Content of a Sandy Loam Temperate Soil

Nitrogen

卷:3

Fred Otim¹  Alfred Obia¹  Lawrence Aula²  Joao Luis Bigatao Souza²  Peter Omara²  Daryl Brain Arnall² 

[1] Department of Agronomy, Gulu University, Gulu P.O. Box 166, Uganda;

[2] Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078, USA;

关键词: biochar;    total nitrogen;    nitrate;    ammonium;    soil organic carbon;   

DOI  :  10.3390/nitrogen3010007

来源: DOAJ

【 摘 要 】

Biochar 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.

【 授权许可】

Unknown