100165 Impacts of Biochar Aging and Soil Type on Soil Nitrogen Dynamics.
Poster Number 187-811
See more from this Division: ASA Section: Environmental Quality
See more from this Session: Biochar Period: If You Have Data We Want to See It (includes student competition)
Monday, November 7, 2016
Phoenix Convention Center North, Exhibit Hall CDE
Abstract:
Interactions between soil type, biochar type, and biochar aging may influence N cycling in soils. To gain a better understanding of biochar impacts on N mineralization and nitrification (gross N transformation process), an 15N tracer study in combination of numerical data analysis has been employed using fresh and laboratory-aged fast pyrolysis biochars and three soil types (sandy loam, silt loam, and clay loam). Soils were mixed with biochar (1% w/w) and sub-samples were then incubated with N-fertilizer (15NH4Cl; at the rate of 170 N lbs/acre) for 0, 3, 7, 14, 35, 63, and 98 days. Moisture content was maintained at field capacity during the incubation. Measurements of ammonium (NH4+) and nitrate (NO3-) concentrations and 15N:14N ratios will be analyzed to assess the impact of biochar on soil gross N transformation and nitrification and mineralization rates. The use of the 15N fertilizer will allow us to distinguish between fertilizer and soil organic matter sources of NH4+ and NO3-. A detailed understanding of biochar effects on N cycling in soils is needed to more accurately calibrate and if necessary revise the new biochar module in the APSIM cropping systems model to better predict biochar impact on soil N bio-availability and N leaching.
See more from this Division: ASA Section: Environmental Quality
See more from this Session: Biochar Period: If You Have Data We Want to See It (includes student competition)