Spatial variability of precompression stress and volumetric water content of a red-yellow latosol (Oxisol)

Authors

  • Karina Marie Kamimura Universidade Federal de Mato Grosso do Sul
  • Moacir de Souza Dias Júnior Universidade Federal de Lavras
  • Marcelo Silva de Oliveira Universidade Federal de Lavras
  • Gérson Rodrigues dos Santos Universidade Federal de Viçosa
  • Paulo Tácito Gontijo Guimarães Empresa de Pesquisa Agropecuária de Minas Gerais
  • Ayodele Ebenezer Ajayi Federal University of Technology

DOI:

https://doi.org/10.14393/BJ-v36n1a2020-42121

Keywords:

Compactation, Geostatistics, Load bearing capacity

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.

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Published

2020-01-01

How to Cite

KAMIMURA, K.M.., DIAS JÚNIOR, M. de S.., OLIVEIRA, M.S. de ., SANTOS, G.R. dos ., GUIMARÃES, P.T.G.. and AJAYI, A.E.., 2020. Spatial variability of precompression stress and volumetric water content of a red-yellow latosol (Oxisol). Bioscience Journal [online], vol. 36, no. 1, pp. 142–151. [Accessed29 May 2022]. DOI 10.14393/BJ-v36n1a2020-42121. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/42121.

Issue

Section

Agricultural Sciences