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Aerating Grasslands

Effects on Runoff and Phosphorus Losses from Applied Broiler Litter

^a USDA-ARS, 1420 Experiment Station Rd., Watkinsville, GA, 30677
^b 3113 Miller Plant Sciences Bldg., Dep. of Crop & Soil Sciences, Univ. of Georgia, Athens, GA 30602
^c Central Georgia Research and Education Center, 1508 Godfrey Rd., NW, Eatonton, GA31024

View larger version (40K): [in this window] [in a new window]   Fig. 1. Distribution of soil series: Cecil (fine, kaolinitic, thermic Typic Kanhapludults), Altavista (fine-loamy, mixed, semiactive, thermic Aquic Hapludults), Helena (fine, mixed, semiactive, thermic Aquic Hapludults), and Sedgefield (fine, mixed, active, thermic, Aquultic Hapludalfs) which are labeled on the map. Shades of gray represent drainage classes (well-drained, moderately, well-drained, and poorly drained) for each field (see legend on map). Aerated fields were Fields 2, 5, and 6.

View larger version (29K): [in this window] [in a new window]   Fig. 2. Rainfall distributions by year for baseline (before aeration), 1995 through 1998 and for the period during aeration, 2001 through 2003. Amount of rainfall (mm) for each rainfall event is represented by a vertical bar.

View larger version (27K): [in this window] [in a new window]   Fig. 3. Runoff volumes from aerated (y axis) and nonaerated fields (x axis) "Before" and "After" aerated periods. (a) Field 2; (b) Field 5; (c) Field 6.

View larger version (43K): [in this window] [in a new window]   Fig. 4. Concentrations and mass losses of (a) and (c) total P and (b) and (d) DRP in runoff from Field 2 (aerated, y axis) and Field 1 (nonaerated, x axis) "Before" and "After" aerated periods.

View larger version (34K): [in this window] [in a new window]   Fig. 5. Concentrations and mass losses of (a) and (c) total P and (b) and (d) DRP in runoff from Field 5 (aerated, y axis) and Field 4 (nonaerated, x axis) "Before" and "After" aerated periods.

View larger version (42K): [in this window] [in a new window]   Fig. 6. Concentrations and mass losses of (a) and (c) total P and (b) and (d) DRP in runoff from Field 6 (aerated, y axis) and Field 3 (nonaerated, x axis) "Before" and "After" aerated periods.

View larger version (17K): [in this window] [in a new window]   Fig. 7. Elevations (m) and depth of soil morphological features which could impede water drainage through the soil. The features include the start of the Bt horizon, the depth at which redoximorphic features first appear, and the depth at which the BC horizon begins.