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Soil Hydraulic Properties Influenced by Stiff-Stemmed Grass Hedge Systems

^a Indonesia Center for Soil and Agroclimate Research and Development, Jl. Ir. H. Juanda 98 Bogor, Indonesia 16123
^b 302 Anheuser-Busch Natural Resources Bldg., Dep. of Soil, Environmental and Atmospheric Sciences, Univ. of Missouri, Columbia, MO 65211
^c USDA-ARS, 268 Agricultural Eng. Building, Columbia, MO 65211

View larger version (10K): [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 (31K): [in a new window]   Fig. 2. Effects of position and depth on (A) silt content, (B) clay content, (C) organic matter, and (D) bulk density. GH = Grass hedge; RC = Row crop; DZ = Deposition zone. Bars indicate LSD(0.05) values.

View larger version (36K): [in a new window]   Fig. 3. Effects of position on soil water retention at depths of (A) 0 to 10 cm, (B) 10 to 20 cm, (C) 20 to 30 cm, and (D) 30 to 40 cm. GH = Grass hedge; RC = Row crop; DZ = Deposition zone. Bars indicate LSD(0.05) values that are the same for all four depths at a water potential. LSD values are presented for the first two water potentials; other values were not determined due to heterogeneity of variance among positions.

View larger version (29K): [in a new window]   Fig. 4. Effects of position and depth on the distribution of (A) macropores, (B) coarse mesopores, (C) fine mesopores, and (D) micropores. GH = Grass hedge; RC = Row crop; DZ = Deposition zone. Macropores (>1000 µm diam.), coarse mesopores (60–1000 µm diam.), fine mesopores (10–60 µm diam.), and micropores (<10 µm diam.). Bars indicate LSD(0.05) values.

View larger version (16K): [in a new window]   Fig. 5. Effects of position and depth on saturated hydraulic conductivity (Ksat). GH = Grass hedge; RC = Row crop; DZ = Deposition zone. Bar indicates LSD(0.05) value.