Porous Plate Apparatus for Measuring Moisture Retention and Transmission by Soil

Richards, L. A.

doi:10.1097/00010694-194808000-00003

Cited by 219 publications

(115 citation statements)

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“…The objectives of the present study were to 1) investigate the relationship between SPQ status assessed via the S i and S d methods, 2) outline conditions that preclude the use of S-Index for the soils ROSETTA (Schaap et al, 2001) PTF (S i ), was used for the conversion of soil physical data into hydraulic parameters. British Standard Institution, 1989) and SWRC (0 to -1.5 hPa) (sand box and pressure plate; Richards, 1948), which were used to derive the S-term. The retention curve retention curve (RETC) software (Schaap et al, 2001), which incorporates both SWRC fitting equations (S d ) [e.g.…”

Section: Comparison Of S I and S Dmentioning

confidence: 99%

Application of Dexter’s soil physical quality index: an Irish case study

Fenton

Vero

Schulte

et al. 2017

Irish Journal of Agricultural and Food Research

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Historically, due to a lack of measured soil physical data, the quality of Irish soils was relatively unknown. Herein, we investigate the physical quality of the national representative profiles of Co. Waterford. To do this, the soil physical quality (SPQ) S-Index, as described by Dexter (2004a,b,c) using the S-theory (which seeks the inflection point of a soil water retention curve [SWRC]), is used. This can be determined using simple (S-Indirect) or complex (S-Direct) soil physical data streams. Both are achievable using existing data for the County Waterford profiles, but until now, the suitability of this S-Index for Irish soils has never been tested. Indirect-S provides a generic characterisation of SPQ for a particular soil horizon, using simplified and modelled information (e.g. texture and SWRC derived from pedo-transfer functions), whereas Direct-S provides more complex site-specific information (e.g. texture and SWRC measured in the laboratory), which relates to properties measured for that exact soil horizon. Results showed a significant correlation between S-Indirect (S i ) and S-Direct (S d ). Therefore, the S-Index can be used in Irish soils and presents opportunities for the use of S i at the national scale. Outlier horizons contained >6% organic carbon (OC) and bulk density (B d ) values <1 g/cm 3 and were not suitable for S i estimation. In addition, the S-Index did not perform well on excessively drained soils. Overall correlations of S i with B d and of S i with OC% for the dataset were detected. Future work should extend this approach to the national scale dataset in the Irish Soil Information System.

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Section: Comparison Of S I and S Dmentioning

confidence: 99%

Application of Dexter’s soil physical quality index: an Irish case study

Fenton

Vero

Schulte

et al. 2017

Irish Journal of Agricultural and Food Research

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“…Las constantes de humedad de CC y PMP, correspondieron a 26 y 13%, respectivamente, de acuerdo con determinaciones previas al establecimiento del experimento, mediante el uso de la técnica de la olla de membrana de presión, citada por Richards (1948), la cual consiste en identificar los diferentes contenidos de agua en el suelo, en función de tensiones de energía, en unidades de presión como los Kpa. De esta manera, la curva de retención de humedad se define como la relación entre el potencial matricial y el contenido de agua en un suelo.…”

Section: Diseño Y Desarrollo Del Experimentounclassified

Evaluación de tres variedades de frijol pinto bajo riego y sequía en Durango, México.

et al. 2015

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El objetivo de este estudio fue evaluar el crecimiento y fisiología de tres variedades de frijol en condiciones de riego y sequía. El estudio se llevó a cabo durante el 2014 en el campo experimental de la Universidad Autónoma de Chapingo, Unidad Regional Universitaria de Zonas Áridas, Durango, México. Se usó un diseño experimental de bloques al azar con tres repeticiones en un arreglo de parcelas divididas. Estas parcelas fueron los contenidos de humedad en el suelo: favorable, próximo a capacidad de campo (CC: 22-26%) y desfavorable, próximo al punto de marchitez permanente (PMP: 16-20%); las subparcelas fueron las variedades de frijol: Pinto Centauro, Pinto Americano y Pinto Saltillo. La variedad Pinto Centauro fue la de mayor altura de planta (10,2 cm), cobertura vegetal (155,1 cm2) y producción de materia seca por planta (5,2 g) y fisiológicamente sobresalió en su eficiencia en el uso de agua (15,8 μmol de CO2: μmol de H20). La variedad Pinto Americano fue la de mayor estabilidad en crecimiento y desarrollo al pasar de la condición de humedad favorable (CC) a la desfavorable (PMP), lo cual la hace más viable ante condiciones restrictivas de disponibilidad hídrica; pero alta susceptibilidad a la pudrición de raíz asociada a patógenos del suelo.

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“…Traditionally, the drying phase of the SWCC has been assessed using laboratory devices, including pressure plates (Richards, 1948(Richards, , 1965, Tempe cells (Reginato and Bavel, 1962; ASTM] D6836-02, 2008) and hanging columns (ASTM D6836-02, 2008), which apply pressure or suction, thus forcing water from the samples. However, these methods can be slow and arduous (Gee et al, 2002;Bittelli and Flury, 2009;Dexter et al, 2012;Gubiani et al, 2012) and susceptible to errors, particularly at low water potentials (Peck and Rabbidge, 1969;Campbell, 1988;Cresswell et al, 2008;Bittelli and Flury, 2009).…”

Section: Introductionmentioning

confidence: 99%

A methodological framework to determine optimum durations for the construction of soil water characteristic curves using centrifugation

Vero¹,

Healy²,

Henry³

et al. 2016

Irish Journal of Agricultural and Food Research

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During laboratory assessment of the soil water characteristic curve (SWCC), determining equilibrium at various pressures is challenging. This study establishes a methodological framework to identify appropriate experimental duration at each pressure step for the construction of SWCCs via centrifugation. Three common temporal approaches to equilibrium – 24-, 48- and 72-h – are examined, for a grassland and arable soil. The framework highlights the differences in equilibrium duration between the two soils. For both soils, the 24-h treatment significantly overestimated saturation. For the arable site, no significant difference was observed between the 48- and 72-h treatments. Hence, a 48-h treatment was sufficient to determine ‘effective equilibrium’. For the grassland site, the 48- and 72-h treatments differed significantly. This highlights that a more prolonged duration is necessary for some soils to conclusively determine that effective equilibrium has been reached. This framework can be applied to other soils to determine the optimum centrifuge durations for SWCC construction.

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Porous Plate Apparatus for Measuring Moisture Retention and Transmission by Soil

Cited by 219 publications

References 0 publications

Application of Dexter’s soil physical quality index: an Irish case study

Application of Dexter’s soil physical quality index: an Irish case study

Evaluación de tres variedades de frijol pinto bajo riego y sequía en Durango, México.

A methodological framework to determine optimum durations for the construction of soil water characteristic curves using centrifugation

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