Infiltration Variability in Agricultural Soil Aggregates Caused by Air Slaking
- 1 Downloads
This article reports on variation in infiltration rates of soil aggregates as a result of phenomenon known as air slaking. Air slaking is caused by the compression and subsequent escape of air captured inside soil aggregates during water saturation. Although it has been generally assumed that it occurs mostly when dry aggregates are rapidly wetted, the measurements used for this paper have proved that it takes place even if the wetting is gradual, not just immediate. It is a phenomenon that contributes to an infiltration variability of soils. In measuring the course of water flow through the soil, several small aggregates of five agricultural soils were exposed to distilled water at zero tension in order to characterize their hydraulic properties. Infiltration curves obtained for these aggregates demonstrate the effect of entrapped air on the increase and decrease of infiltration rates. The measurements were performed under various moisture conditions of the A-horizon aggregates using a simple device.
Keywordsaggregate breakdown moisture content aggregate stability rainfall simulation
Unable to display preview. Download preview PDF.
- 2.W. W. Emerson, “Physical properties and structure,” in Soil Factors in Crop Production in a Semi-Arid Environment, Ed. by J. S. Russell and E. L. Greacen (University of Queensland Press, St. Lucia, 1977), pp. 78–104.Google Scholar
- 4.Guidelines for Soil Description (Food and Agriculture Organization, Rome, 2006).Google Scholar
- 6.K. Fiala, J. Kobza, L. Matúšková, V. Breková, J. Makovníková, G. Baraníková, et al., Definite Methods of Soil Analyses, Sub-Monitoring System–Soil (Vys-kumny Ustav Podoznalectva Ochrany Pody, Bratislava, 1999) [in Slovak].Google Scholar
- 8.D. Hillel, Environmental Soil Physics (Academic, London, 1998).Google Scholar
- 9.J. Hraško, L. Cervenka, Z. Facek, J. Komár, J. Nemecek, et al., Soil Analyses (Slovak Agricultural Literature Publishing, Bratislava, 1962) [in Slovak].Google Scholar
- 10.IUSS Working Group WRB, World Reference Base for Soil Resources 2014, International Soil Classification System for Naming Soils and Creating Legends for Soil Maps, World Soil Resources Reports No. 106 (Food and Agriculture Organization, Rome, 2014).Google Scholar
- 11.W. D. Kemper, and E. J. Koch, Aggregate Stability of Soils from Western United States and Canada: Measurement Procedure, Correlations with Soil Constituents (U.S. Government Printing Office, Washington, 1966).Google Scholar
- 17.Z. X. Li, C. F. Cai, Z. H. Shi, and T. W. Wang, “Aggregate stability and its relationship with some chemical properties of red soils in subtropical China,” Pedosphere 15, 129–136 (2005).Google Scholar
- 18.M. M. Mortland, and W. D. Kemper, “Specific surface,” in Methods of Soil Analysis, Ed. by C. A. Black (American Society of Agronomy, Madison, 1965), pp. 532–544.Google Scholar
- 19.P. Rengasamy, R. S. B. Greene, and G. W. Ford, “The role of clay fraction in the particle arrangement and stability of soil aggregates—a review,” Clay Res. 3, 53–67 (1984).Google Scholar