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      Soil texture analyses using a hydrometer: modification of the Bouyoucos method Translated title: Análisis de textura del suelo con hidrómetro: modificaciones al método de Bouyoucus

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          Abstract

          A.N. Beretta, A.V. Silbermann, L. Paladino, D. Torres, D. Bassahun, R. Musselli, and A. García-Lamohte. 2014. Soil texture analyses by hydrometer: modifications of the Bouyoucos method. Cien. Inv. Agr. 41(2): 263-271. The Robinson pipette method (Pipette) is accurate and precise but time consuming. Bouyoucos (1936) proposed a more rapid and simpler procedure called the hydrometer method. Both analytical techniques are sedimentation procedures accepted as standard techniques for particle-size analysis. The sand, silt, and clay contents of several soil samples were determined using the Pipette method as a control and compared with the Bouyoucus, the Bouyoucos Modified (Bouyoucos_M) and the Bouyoucos Modified with gravimetric determination of the sand content (Bouyoucos_M-T) methods. Data obtained from these procedures was used to assess soil textural class, the soil erodibility coefficient (K), the water retained at field capacity (FC) and the permanent wilting point (PWP). In the Bouyoucos_M method, the soil organic matter (SOM) was destroyed and the dispersingagent concentration was increased. In the Bouyoucos_M-T method, the sand was quantified gravimetrically by sieving samples through a 53 µm mesh. The hydrometer and Pipette methods measurements correlated well. The Bouyoucos and the Bouyoucus-M methods overestimated the sand content. The performance of the Bouyoucos_M-T method did not differ from that of the Pipette method. Compared with the Pipette method, the Bouyoucus method underestimated the clay content, and the Bouyoucos_M method did not differ from the Pipette method. The values obtained with the Bouyoucos_M and the Bouyoucos methods underestimated the FC and the PWP, and Bouyoucos_M-T method did not differ from estimations based on the Pipette method data. The assessed K value was underestimated with the Bouyoucos_M method. The Bouyoucos and the Bouyoucos_M-T methods estimated the K values similar to the Pipette method. The Bouyucus_M-T method is suitable for determining the soil texture and inferring soil properties but is unacceptable for assessing the class texture for soil taxonomic classification.

          Translated abstract

          A.N. Beretta, A.V. Silbermann, L. Paladino, D. Torres, D. Bassahun, R. Musselli y A. García-Lamohte. 2014. Análisis de textura del suelo con hidrómetro: modificaciones al método de Bouyoucus. Cien. Inv. Agr. 41(2): 263-271. El método de la Pipeta de Robinson (Pipeta) es exacto y preciso, pero insume mucho tiempo. Bouyoucos (1936) propuso el método del hidrómetro como más rápido y simple. Ambos métodos de sedimentación se aceptan para el análisis textural del suelo. Se comparó el contenido de arena, limo y arcilla de varias muestras de suelo. Se asumió el método de la Pipeta como control y se comparó con: Bouyoucus; una modificación de Bouyoucos, con destrucción de materia orgánica y mayor concentración de dispersante (Bouyoucos_M); y Bouyoucos_M con determinación gravimétrica de arena previo tamizado de las muestras con malla de 53 µm (Bouyoucos_M-T). Los datos se emplearon para evaluar: clase textural; coeficiente de erodabilidad (K); agua retenida a capacidad de campo (CC); y el punto de marchitez permanente (PMP). Hubo buena correlación entre las mediciones con hidrómetro y la Pipeta. El método Bouyoucos o Bouyoucus-M sobreestimó el contenido de arena, pero Bouyoucos_M-T no difirió. Bouyoucus subestimó el contenido de arcilla y Bouyoucos_M no difirió. Con los datos de Bouyoucos_M y Bouyoucos se subestimaron FC y PWP; con Bouyoucos_M-T no hubo diferencias de las estimaciones al comparar con la Pipeta. Se subestimó el coeficiente K al utilizar los datos de Bouyoucos_M. Con Bouyoucos o Bouyoucos_M-T, los valores estimados de K no difirieron de los estimados a partir de la Pipeta. Bouyucus_M-T fue adecuado para inferir las propiedades del suelo, pero inaceptable para adjudicar la clase textural con el fin de clasificar suelo con fines taxonómicos.

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          Most cited references15

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          Hydrometer Method Improved for Making Particle Size Analyses of Soils1

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            DIRECTIONS FOR MAKING MECHANICAL ANALYSES OF SOILS BY THE HYDROMETER METHOD

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              Methods of soil analysis

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                Author and article information

                Journal
                ciagr
                Ciencia e investigación agraria
                Cienc. Inv. Agr.
                Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal (Santiago, , Chile )
                0718-1620
                2014
                : 41
                : 2
                : 263-271
                Affiliations
                [02] Montevideo orgnameMinisterio de Ganadería, Agricultura y Pesca Uruguay
                [01] Colonia orgnameInstituto Nacional de Investigación Agropecuaria Uruguay aberetta@ 123456inia.org.uy
                Article
                S0718-16202014000200013 S0718-1620(14)04100200013
                10.4067/S0718-16202014000200013
                7e72cc37-912a-425e-8dab-4d2af4c8d5b8

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 26 November 2013
                : 22 April 2014
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 15, Pages: 9
                Product

                SciELO Chile

                Categories
                RESEARCH NOTES

                particle sedimentation,particle size distribution,Pipette method,Distribución de tamaño de partículas,método de la Pipeta,sedimentación de partículas

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