Resumo

RODRIGUEZ ACOSTA, Daniel; LOBO LUJAN, Deyanira  e  TORRENTE TRUJILLO, Armando. Soil granulometry in slope areas. Comparison of determination methods. Acta Agron. [online]. 2023, vol.72, n.1, pp.38-46.  Epub 24-Abr-2024. ISSN 0120-2812.  https://doi.org/10.15446/acag.v72n1.107333.

Particle size distribution (PSD) is a relevant property of soils since its physical behavior depends on it, and because of its relationship with other soil properties and its usefulness as a key parameter of pedotransfer functions (PTF). The objective of this research was to compare the Bouyoucos and modified Bouyoucos (Bouyoucos-Day) methods to quantify the particle size distribution in soils of a hillside located in the municipality of La Plata, district of Lusitania, department of Huila, Colombia. For this, disturbed soil samples were taken from 6 areas of the same hillside, where 4 samples were taken randomly in each area, for a total of 24 sampling sites. The samples were analyzed using the 2 methods, considering that the main difference laid in the times of the readings with the hydrometer followed by taking the temperature of the suspension, as well as the use of different correction factors. The data analysis was carried out considering a factorial design with two levels (methods). Likewise, the analysis was carried out considering the different zones of the hillside, with 6 levels (cultivation, high degraded, medium 1, medium 2, medium 3, and low). The results revealed significant differences in the clay and sand contents, showing higher clay contents with the Bouyoucos method in all the soil samples. The Bouyoucos- Day method presented a higher silt content was presented by the Bouyoucos-Day method in a large number of soil samples, without significant differences, which is attributable to the need for a longer time to settle the silt in suspension, being limited to 2 hours in Bouyoucos method. Such a difference causes changes in the textural class, which affects the decision making in the estimation of soil properties and the processes that include this fundamental property.

Palavras-chave : Bouyoucos; modified Bouyoucos; textural class; granulometry.

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