Spatial variability of soil physical-hydric attributes under bovine trampling in agreste of Pernambuco State, Brazil

• Main Authors: Pedro Henrique Dias Batista, Gledson Luiz Pontes de Almeida, Héliton Pandorfi, Uilka Elisa Tavares, Airon Aparecido Silva de Melo, Cristiane Guiselini
• Format: Article
• Language: English
• Published: Eduem (Editora da Universidade Estadual de Maringá) 2018-11-01
• Series: Acta Scientiarum: Agronomy
• Subjects: compaction soil; geostatistic; girolando; grazing; ordinary kriging.
• Online Access: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39594

Soils under pastures suffer physical modifications, in greater or lesser intensity, via the action of animal trampling. Thus, the aim was to evaluate the spatial dependence of soil physical attributes under bovine trampling. The trial was performed at Roçadinho Farm, Agreste of Pernambuco, Brazil, in a 40 x 40 m paddock that was managed with continuous stocking by bovines and 12 AU ha-1 stocking rate. Soil samples were collected before and after grazing using a 6 x 6 m grid, totaling 36 sampling points. At each point, the bulk density, total porosity, moisture, soil penetration resistance at 0.00 - 0.10, 0.10 - 0.20, and 0.20 - 0.30 m depth were estimated, as was the hydraulic conductivity on the saturated soil surface. Descriptive statistics and geostatistics supported the data analysis. A normal distribution was verified for all variables, which were scored as either low or high variability in terms of the variation coefficient. The physical attributes (density, total porosity, moisture, soil penetration resistance and hydraulic conductivity) of the soil sampled presented a strong spatial dependence before and after grazing.