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Title: Spatial variability of precompression stress and volumetric water content of a red-yellow latosol (Oxisol)
Other Titles: Variabilidade espacial da pressão de preconsolidação e da umidade volumétrica de um latossolo vermelho amarelo
Keywords: Soil compaction
Load-bearing capacity
Compactação do solo
Capacidade de carga
Issue Date: Jan-2020
Publisher: Universidade Federal de Uberlândia
Citation: KAMIMURA, K. M. et al. Spatial variability of precompression stress and volumetric water content of a red-yellow latosol (Oxisol). Bioscience Journal, Uberlândia, v. 36, n. 1, p. 142-151, jan./fev. 2020. DOI:
Abstract: The intensive agricultural machinery traffic to which soils under coffee crops are exposed may cause significant changes in soil structure. The goals of this study were to: a) characterize the spatial variability of precompression stress (σp) and volumetric water content (θ) of a Red-Yellow Latosol (Oxisol) and determine their spatially dependent structures using ordinary kriging semivariograms; b) using this date to construct a load-bearing capacity (LBC) map for the site, identifying the depth with higher ; and c) use the map as a decision support tool regarding agricultural machinery logistic management in coffee plantations. The research was conducted on an experimental farm of the Agricultural Research Company of Minas Gerais (Epamig), Patrocinio, MG, on a clayey Oxisol. Samples were collected from 2.0 × 1.5 m sampling pits at intersections of a rectangular 40 × 150 m grid, totaling 28 sampling points. The soil samples were collected with metal rings (0.0254 m in height and 0.0630 m in diameter) using an Uhland sampler. Sampling at each pit was at 3 layers: 0.00–0.03 m, 0.10–0.13 m, and 0.25–0.28 m, and seven samples arranged in a matrix form were collected at each layer, totaling 588 samples. The σp and θ showed a spatially dependent structure. The depth of 0.00–0.03 m showed higher LBC, indicating that this depth was more compacted compared to other depths. Based on the σp maps, the tractor and the combine should not traffic into the areas at water content of 0.45 m3 m-3, because the soil has a LBC of 200 kPa. If this condition is not respected, additional compaction will occur. Tractor traffic is permissible when the water content reaches values less than 0.36 m3 m-3, whereas for combine traffic, the water content values must be less than 0.30 m3 m-3.
Appears in Collections:DCS - Artigos publicados em periódicos
DES - Artigos publicados em periódicos

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