Forma e diâmetro de agregados do solo como fontes de variação na resistência tênsil

Lucas de Sousa Oliveira; Alexandre dos Santos Queiroz; Angélica da Silva Lopes; Francisca Gleiciane da Silva; Jaedson Cláudio Anunciato Mota

doi:10.18378/rvads.v16i1.7825

Authors

Lucas de Sousa Oliveira Universidade Federal do Ceará, Fortaleza https://orcid.org/0000-0002-6564-9252
Alexandre dos Santos Queiroz Universidade Federal do Ceará, Fortaleza
Angélica da Silva Lopes Universidade Federal do Ceará, Fortaleza
Francisca Gleiciane da Silva Universidade Federal do Ceará, Fortaleza
Jaedson Cláudio Anunciato Mota Universidade Federal do Ceará, Fortaleza https://orcid.org/0000-0002-1261-9754

DOI:

https://doi.org/10.18378/rvads.v16i1.7825

Keywords:

Soil structure, Soil physics, Soil quality

Abstract

Soil quality is essential to ensure the sustainability of agro-ecosystems. Tensile strength is one of the indicators frequently used for monitoring soil quality, being influenced by several factors, such as the size and shape of the aggregate. In this research, the hypothesis that the use of a single form of soil aggregates reduces the variability in the evaluation of the structural quality of soils was considered. In addition, the size of the aggregates influences the determination of tensile strength. Thus, the objective was to evaluate the relationship of tensile strength with the size and shapes that aggregates can assume. Two aggregate diameter bands (25-19 and 19-7.96 mm) and three aggregate forms (irregular, planed and spherical bases) were used. The aggregates with smaller diameters (13.5 mm) presented the highest mean values of tensile strength (82.73 kPa). The tensile strength determined in spherical aggregates showed less variability. For these aggregates, the coefficient of variation of the tensile strength was 29.30 and 19.29%, for the average diameters of 22 and 13.5 mm, respectively. As a result, shape must be considered when assessing the tensile strength of the soil aggregate.

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Author Biography

Lucas de Sousa Oliveira, Universidade Federal do Ceará, Fortaleza

Engenheiro Agrônomo formado pela Universidade Federal do Piauí. Atualmente doutorando do Programa de Pós-Graduação em Ciência do Solo, na Universidade Federal do Ceará.

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