Abstract
ABSTRACT Compressive soil properties are typically used for the understanding of compaction process. As an alternative to laboratory tests, pedo-transfer functions have been used to estimate the mechanical behaviour of soil as a function of soil physical parameters. The impact of soil bulk density (BD) and gravimetric water content (w) was examined on soil strength and pedo-transfer functions were proposed to predict the precompression stress (σp) in an Ultisol cultivated with sugarcane. Undisturbed soil cores were sampled at the depths of 0-0.20 and 0.20-0.40 m, subjected to different water contents, and subsequently, compression tests were performed to determine σp. The data were subjected to analysis of variance and regression analysis. Bulk density and w affected σp positively and negatively, respectively. Approximately 70% of the variation of the σp could be explained as a function of BD and w through an accessible multiple regression model. Comparisons with other pedo-transfer functions showed that estimates of σp may be rather sensitive to soil management and textural classes. Variations imposed by soil management and cohesive character into depth suggest that independent models should be considered to characterise compressive behaviour of soil by horizon or layer.
Highlights
Soil compaction due to agricultural traffic has become a major concern of modern agriculture (Horn et al, 2003; Lima et al, 2017)
The impact of soil bulk density (BD) and gravimetric water content (w) was examined on soil strength and pedo-transfer functions were proposed to predict the precompression stress in an Ultisol cultivated with sugarcane
The determination of σp is complex and time-consuming (Lima et al, 2016; Schjønning & Lamandé, 2018), and pedo-transfer functions have been used to estimate σp as a function of soil physical parameters, which can be obtained in the field (Schjønning & Lamandé, 2018)
Summary
Soil compaction due to agricultural traffic has become a major concern of modern agriculture (Horn et al, 2003; Lima et al, 2017). When soil strength at a given depth is lower than the stress applied by the tyre, the soil undergoes changes due to a reduction in pore volume, resulting on soil compaction (Défossez & Richard, 2002; Stettler et al, 2014; Lima et al, 2018). The determination of σp is complex and time-consuming (Lima et al, 2016; Schjønning & Lamandé, 2018), and pedo-transfer functions have been used to estimate σp as a function of soil physical parameters, which can be obtained in the field (Schjønning & Lamandé, 2018). The literature provides various functions for the estimation of σp, soil management conditions, mineralogy and texture have limited generalised applications (Keller et al, 2015), and the functions have been developed for a given texture, management unit or soil class (Stettler et al, 2014)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Revista Brasileira de Engenharia Agrícola e Ambiental
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
