Article Figures & Data
Figures
- Figure 1.
Illustration of aeration enhancement experiment. ODR probes (small black dots) were inserted in three clusters of five probes at each soil depth (15, 30 and 100 cm). A tensiometer (illustrated by dial face) was installed at each depth location. Ten holes were bored around the probe array (large black dots) and 100 psi air was injected using a Gro-Gun® to fracture and lift the soil surface (illustrated by radiating dashed lines).
- Fig. 2.
Corresponding measurements of ODR and O2 concentration at various soil depths and moisture contents at field site 1. A) 15 cm soil depth, B) 30 cm soil depth, and C) 100 cm soil depth.
- Fig. 3.
Site conditions and soil features at field site 2. A) Soil ODR and O2 measurements at 15,30 and 100 cm depths at different soil moisture contents. B) Tensiometer readings at three soil depths over a 14 day interval. C) Soil moisture release curves for undisturbed cores recovered from 15, 30 and 100 cm depths.
- Fig. 4.
Fig. 4. Site conditions and soil features at field site 3. A) Soil ODR measurements at 15,30 and 100 cm depths at different soil moisture contents. B) Tensiometer readings at three soil depths over a 9 day interval. C) Soil moisture release curves for undisturbed cores recovered from 15, 30 and 100 cm depths.
- Fig. 5.
Site conditions and soil features at field site 4. A) Soil ODR measurements at 15 and 30 cm depths at different soil moisture contents. Inset box shows magnified X and Y axis differentiate individual data points. B) Tensiometer readings at three soil depths over a 14 day interval. C) Soil moisture release curves for undisturbed cores recovered from 15, 30 and 100 cm depths.
- Fig. 6.
Site conditions and soil features at field site 5. A) Soil ODR measurements at 15,30 and 100 cm depths at different soil moisture contents. B) Tensiometer readings at three soil depths over a 10 day interval. C) Soil moisture release curves for undisturbed cores recovered from 15, 30 and 100 cm depths.
- Fig. 7.
Site conditions and soil features at field site 6. A) Tensiometer readings at three soil depths over a 12 day interval. B) Mean soil ODR measurements at 15, 30 and 100 cm depths over time. Arrow indicates date of air injection treatment (refer to Fig. 1 for illustraion of experimental design).
Tables
Depth (cm) Textural Analysisa Bulk Restrictive Site Sand Silt Clay Classificationb Densityc R.L.D.d B.D.e 1 10-15 40 36 24 Loam 1.49 1.50-1.60 25-30 18 49 33 Sil. CI. Loam 1.36 1.40-1.45 90-100 17 54 29 Sil. CI. Loam 1.33 1.40-1.45 2 10-15 39 46 15 Loam 1.51 1.50-1.60 25-30 70 20 10 Sndy. Loam 1.29 1.60-1.70 90-100 61 29 10 Sndy. Loam 1.30 1.60-1.70 3 10-15 62 14 24 Sndy. CI. Loam 1.40 5.24 1.55-1.75 25-30 46 26 28 Clay Loam 1.35 3.29 1.45-1.55 90-100 33 25 42 Clay 1.32 1.22 1.40-1.55 4 10-15 52 26 22 Sndy. CI. Loam 1.57 1.55-1.75 25-30 57 25 18 Sndy. Loam 1.55 1.60-1.70 90-100 29 43 28 Loam 1.48 1.50-1.60 5 10-15 26 39 35 Clay Loam 1.56 0.68 1.45-1.55 25-30 37 33 40 Clay Loam 1.72 0.28 1.45-1.55 90-100 25 35 40 Clay/Cl. Loam 1.30 0.11 1.45-1.55 6 10-15 23 43 34 Clay Loam 1.54 1.45-1.55 25-30 22 43 35 Clay Loam 1.60 1.45-1.55 90-100 21 38 41 Clay 1.19 1.40-1.55 ↵a Percent sand, silt and clay, by weight.
↵b Textural classification. Sil.=silty, CI.=clay, Sndy.=sandy.
↵c Bulk density in g/cm3
↵d Root length density in cm root/cm3 soil.
↵e The bulk density at which a soil of this textural classification would be predicted to inhibit root growth (see Morris and Lowery, 1988).
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