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Influence of Stiff-Stemmed Grass Hedge Systems on Infiltration

^a Indonesia Center for Soil and Agroclimate Research and Development, Jl. Ir. H. Juanda 98 Bogor, Indonesia 16123
^b 302 Anheuser-Busch Natural Resources Building, Dep. of Soil, Environmental and Atmospheric Sciences, Univ. of Missouri, Columbia, MO 65211
^c 254 Agricultural Engineering Building, Dep. of Biological Engineering, Univ. of Missouri, Columbia, MO 65211

View larger version (9K): [in a new window]   Fig. 1. Schematic sketch of grass hedge system illustrating the width of hedge (W1), width of cropped area (W2), original soil slope (So), and sampling positions (grass hedge, deposition zone 0.5 m upslope of the hedge, and row crop 7 m upslope of the hedge).

View larger version (21K): [in a new window]   Fig. 2. The models of Green and Ampt, Parlange, and Kostiakov fitted to measured ponded infiltration data for typical replicates under (A) grass hedge, (B) row crop, and (C) deposition positions; Treynor, IA in 2001.

View larger version (17K): [in a new window]   Fig. 3. Plot of quasi-steady state infiltration rate means (n = 6) vs. tension for the grass hedge and row crop positions at Treynor, IA in 2002. Bars represent the standard error of the means of six observations.

View larger version (19K): [in a new window]   Fig. 4. Field saturated hydraulic conductivity (Kfs, 2001 data) vs. laboratory saturated hydraulic conductivity (Ksat) (A) with bentonite and (B) without bentonite (n = 18).