An evaluation of biochar pre-conditioned with urea ammonium nitrate on maize (Zea mays L.) production and soil biochemical characteristics

作者：Dil Matthew^*; Oelbermann Maren; Xue Wei

来源：Canadian Journal of Soil Science, 2014, 94(4): 551-562.

DOI：10.4141/CJSS-2014-010

• Nitrogen uptake
• nitrogen utilization efficiency
• potted trial
• ammonium
• soil microbial biomass
• nitrate
• soil organic carbon
• soil texture

Biochar can enhance soil fertility, plant nutrient uptake and crop production. Using a potted study, we quantified the effects of adding biochar at 1 t ha(-1) (Char), biochar pre-conditioned with urea ammonium nitrate [UAN (Char(+))], or UAN only to a control (Contr) with no amendments on maize (Zea mays L.) biomass production, tissue carbon (C) and nitrogen (N) concentrations, N uptake (NU), N utilization efficiency (NUtE), and soil chemistry and biology in coarse-, medium-and fine-textured soils over 6 wk. Soil pH decreased (P %26lt; 0.05) in Char(+) and UAN treatments for all soil textures. Soil organic carbon (SOC) increased (P %26lt; 0.05) in the coarse and medium textured soil in Char and Char(+) treatments. Soil ammonium and soil nitrate were different (P %26lt; 0.05) among treatments; increasing or decreasing depending upon soil texture. Soil microbial biomass C was lowest (P %26lt; 0.05) in the UAN treatment for all soil textures. Soil potential microbial activity was significantly greater in the coarse-textured soil in only the Char and Char(+) treatments. Maize biomass, tissue N concentration, and NU increased (P %26lt; 0.05) in soils amended with Char(+) or UAN only. NUtE was lower (P %26lt; 0.05) in Char(+) and UAN treatments in the coarse-and medium-textured soils, but this was reversed for the fine-textured soil.

• 出版日期2014-8