Soil carbon dioxide efflux from a claypan soil affected by surface compaction and applications of poultry litter [An article from: Agriculture, Ecosystems and Environment]

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Description:
The effects of soil compaction on soil physical properties may alter soil microbial activities and processes, including carbon (C) cycling, and possibly affect agricultural production and environmental degradation. This study investigated the effects of surface soil compaction on soil C mineralization in a claypan soil amended with poultry litter (i.e. turkey excrement mixed with pine shavings as bedding). In a laboratory study, a Mexico silt loam soil was compacted to four bulk density levels (1.2, 1.4, 1.6 and 1.8Mgm^-^3) with and without poultry litter and incubated at 25^oC for 42 days. A field experiment with plots that were maintained fallow was also conducted in 2001 and 2002 on the same claypan soil in North Central Missouri. Soil was amended with litter (0 and 19Mgha^-^1) and left uncompacted or uniformly compacted. Results showed that soil CO"2 efflux was decreased by compaction up to 72% in the laboratory study and 46% in the field study of 2002 (P