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- W2039307702 abstract "This study investigated post-harvest temporal changes in macroporosity and hydraulic properties, relative to subsurface drain position, at three different locations within a single field. Tension and double-ring infiltrometer tests were conducted on the field surface at distances between 0 and 4 m from drains to determine hydraulic conductivity and a soil structural parameter as a function of pressure head [K(ψ) and α′(ψ), respectively], and field-saturated hydraulic conductivity (Kfs). At two of the locations, duplicate sets of infiltration tests were conducted on significantly drier soils about 1 mo after the initial tests. Macroporosity values at each location were determined visually and with capillary theory (i.e., hydraulically effective macroporosity, ), and results from the two methods were compared. At the two field locations with relatively low B horizon permeability, surface soil Kfs was greatest above the drains; however, at the location with the greatest B horizon permeability, surface soil Kfs increased away from the drain. The Kfs was also significantly (P < 0.1) greater under drier soil conditions. Although α′(ψ) and K(ψ) relationships were not influenced by drain position, they did exhibit temporal variability. For ψ < −2 cm, both α′(ψ) and K(ψ) were less in dry soil, whereas for ψ > −1 cm, both α′(ψ) and K(ψ) tended to be greater in dry soil. The was not influenced by drain position but tended to be greater in wetter soil, although attributable to pores with equivalent diameter >0.3 cm tended to be greater in dry soil. The was approximately 100 times less than visible macroporosity." @default.
- W2039307702 created "2016-06-24" @default.
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- W2039307702 date "2012-03-01" @default.
- W2039307702 modified "2023-10-04" @default.
- W2039307702 title "Spatial and Temporal Influences on Hydraulic Properties in Macroporous Tile-Drained Soil" @default.
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- W2039307702 doi "https://doi.org/10.2136/sssaj2011.0194" @default.
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