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This study was carried out in order to check the efficiency in water transport capacity in the trench backfill zone (IT) in 2-45-year-old tile drains, and the differences between IT and the zone midway between trenches (BT) in field-saturated steady-state infiltration rate (I-fs) and saturated hydraulic conductivity (K-s). At seven sites with high clay content, Ifs was recorded in situ in large rings (1 m diameter) and at the same time small cores (7.2 cm in diameter) were sampled to measure K, in the laboratory. There were large differences in drainage efficiency between the "disturbed" trench backfill zone and the "undisturbed" zone midway between trench lines. I-fs and K-s values were in almost all cases larger in IT than in BT. Differences between the plough sole and subsoil, for both I-fs and K-s, were more evident in BT than in IT. The positive effect above the drainpipes, indicating that macropore connectivity was superior in IT, was evident for as long as 45 years after the installation of drainpipes. In BT, I-fs and K, ranged within approximately equal values. In IT, however, I-fs ranged at larger values than K-s. In modelling these kinds of soils, it may be considered whether water transport during heavy rain events should be characterized by a quick onset of water flow in drainpipes caused by the more permeable soil in the backfill trench, and a subsequent slower and more continuous transport of water from the zone between trenches, and in what way the drain water quality is influenced by this. Copyright (c) 2006 John Wiley & Sons, Ltd

Publicerad i

Irrigation and Drainage
2006, volym: 55, nummer: 5, sidor: 523-531
Utgivare: JOHN WILEY & SONS LTD

SLU författare

UKÄ forskningsämne

Jordbruksvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1002/ird.277

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/9389