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Investigación Agraria

On-line version ISSN 2305-0683

Abstract

SILVA AMARAL, Danilo et al. Comparison of samplers in the evaluation of soil physical properties. Investig. Agrar. [online]. 2021, vol.23, n.1, pp.17-21. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2021.junio.2301662.

One of the methods most used in obtaining undisturbed soil samples is the volumetric ring method. Undeformed samples are used, for example, in the evaluation of soil physical properties, such as soil bulk density and porosity. However, there is a diversity of volumetric rings used in the research, which makes it difficult to compare results obtained in these studies. Thus, the objective of this investigation was to compare the values of soil bulk density, microporosity and total porosity, determined from sampling with volume volumetric rings of 100 and 272 cm³, and establish the correlation between them, verifying if the comparison is valid. Soil samples were taken in 25 cultivation sites in Hapludox, which differed in the tillage, culture and/or management system, in the municipality of Rio Paranaíba, MG, at different depths. Data were submitted to Pearson correlation analysis. The correlation between the volumetric rings for all variables was significant, described by the correlation equations y=0.3788+0.7054*x (R=0.68), y=0.1342+0.6582*x (R=0.62), and y=0.1107+0.6071*x (R=0.67), for the variables density, total porosity and microporosity, respectively. It is concluded that it is possible to compare values for the variables determined from the sampling with the two volumetric rings tested.

Keywords : cylinder volume; porosity; soil bulk density; undisturbed sample; Uhland soil sampler.

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