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The stress-strain processes in structured unsaturated arable and forest soils depend very much on the internal soil strength and on the existing hydraulic and mechanical boundary conditions. These variables affect soil deformation by compaction and shearing to a great extent. As soon as the internal soil strength, defined as the precompression stress value, is exceeded by external forces, an intense...
A model for drainage is developed in terms of numbers rather than sizes of pores, recognising that some pores may be blocked or isolated during drainage. The total number of pores is evenly distributed between ten moisture potential steps. The proportion of each of the ten pore size groups that have drained by the end of each drainage step is presented as the Ld distribution.The results of the model...
Polyacrylamide (PAM) is becoming a widely used soil conditioning and erosion control agent, and a better understanding of its transport is required to improve its use. In this study vertical PAM transport through a clay loam soil was investigated using thin soil columns (7.62-cm diameter×2-cm thick) under saturated condition. The columns received a water-soluble, anionic PAM solution (16Mgmol ...
Previous studies have shown that once compacted, forest soils often recover slowly over many decades to pre-disturbed levels for soil properties such as bulk density or penetrometer resistance. This study was conducted to evaluate the effects of selected harvesting techniques on soil physical and hydraulic properties. The effects of logging roads, log landing areas, and logged areas on soil properties...
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