Physicochemical and Structural Properties of an Oxisol under the Addition of Straw and Lime

• DOI: 10.2136/sssaj2017.07.0218
• Publication Date: 2018-01-04T22:12:33Z
• Authors: Márcio R. Nunes; Carlos M. P. Vaz; José E. Denardin; Harold M. van Es; Paulo L. Libardi; Alvaro P. da Silva
• Keywords: Oxisol; Soil horizon; Soil structure; Topsoil

Core Ideas Liming represents a common agricultural practice for abating soil acidity. High doses of lime on the Oxisol surface increases electronegativity system. clay dispersion in uppermost layer. Clay migration led to series physical alterations subsurface layers. Overliming can lead degradation highly weathered structures. Nevertheless, elevated amounts Oxisols, with or without cultural residue addition, could alter physicochemical properties and impact structure. In this context, physical, chemical, structural behaviors an under addition straw were assessed. Lime (0, 3.9, 7.8, 15.6 Mg ha –1 ) either applied incorporated into 0‐ 5‐cm Straw applications followed same procedure quantities 0, 4, 12, 16 . The effects profile evaluated through (specific area, ζ potential, pH), (density, penetration resistance, water dispersible clay, total porosity), micromorphological (surface volume, connectivity, size, pore anisotropy) 1 yr after incubation polyvinyl chloride cylinders 30 cm long 14.5 diameter. application layer increased pH values above 7.0 electronegative potential colloid surface, promoting dispersion. Water‐dispersed migrated profile, causing obstruction, higher density resistance. excessive decreased specific anisotropy degree connectivity promoted slight increase colloids but did not properties.