Effect of maize canopy and water repellency on moisture patterns in a Dutch black plaggen soil |
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Authors: | Dekker Louis W Ritsema Coen J |
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Institution: | (1) DLO Winand Staring Centre for Integrated Land, Soil and Water Research, P.O. Box 125, 6700 AC Wageningen, Netherlands |
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Abstract: | Man-made raised sandy soils in the Netherlands are classified as brown or black plaggen soils. When dry, the brown soils are wettable, but the black soils are water repellent. For one growing season, transects were sampled in a maize cropped black plaggen soil at the Heino experimental farm. Due to interception and stemflow, water was concentrated near the roots of the maize. Between the maize rows, higher soil water contents were found in microdepressions, due to rainwater dripping to the ground from overhanging leaves. Redistribution of soil water from wet to dry areas was restricted by the water repellency of the dry sand. As a consequence, there was a distinct variation in soil moisture content. These irregular wetting patterns did not induce preferential downward flow, but widened over time; because the dry, water repellent subsoil impeded and resisted infiltration into the deeper subsoil. |
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Keywords: | irregular wetting soil water content stemflow thick A-horizon water repellency |
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