BIOGEOCHEMICAL PROCESSES INFLUENCING FORMATION AND STABILIZATION OF SOIL ORGANIC MATTER AND SOIL STRUCTURE
Location: Soil, Water, and Air Resources Research Unit
Title: Impact of Soil Biochar Applications on Nutrient Leaching
| Laird, David |
| Fleming, Pierce |
| Wang, Baiqun - CHINESE ACAD. OF SCIENCES |
| Horton, Robert - IOWA STATE UNIVERSITY |
Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 5, 2008
Publication Date: October 5, 2008
Citation: Laird, D.A., Fleming, P.D., Wang, B., Horton, R., Karlen, D.L. 2008. Impact of Soil Biochar Applications on Nutrient Leaching [CD-ROM]. In: ASA-CSSA-SSSA Annual Meeting Abstracts, Oct. 5-9, 2008, Houston, TX.
Soil applications of biochar, a co-product of lignocellulosic bioenergy production using the pyrolysis platform, has been proposed as a potential means of sequestering carbon, improving soil quality and of returning plant nutrients removed from soils by the harvesting of biomass crops. We used soil columns to investigate the impact of biochar applications and biochar interactions with swine manure on the leaching of NO3, total P, K, and various trace nutrients during a one-year study. A total of 48 columns were repacked with 1 kg of Clarion loam, amended with four levels of biochar (0, 5, 10 and 20 g-biochar/kg-soil) and two levels of dried swine manure (0 or 5 g dry manure/kg-soil). The manure was incorporated in the top 3 cm during week 12 of the experiment. The columns were leached weekly with 200 mL of 0.005 M CaCl2. Among controls receiving no manure, significantly higher amounts of NO3 leached from columns amended with 20 g kg-1 biochar relative to columns containing 0, 5, or 10 g kg-1 biochar. This suggests that biochar enhanced mineralization of soil organic matter. Among columns receiving manure additions, by contrast, 7 to 10% more NO3 leached from the 0 g kg-1 biochar columns than the 5, 10, or 20 g kg-1 biochar columns. A possible explanation for the observed interaction between biochar treatments and manure additions is that readily mineralizable N-containing organic compounds from the manure were adsorbed and stabilized by the biochar.