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Redistribution of Bromide by Rainfall Infiltration into a Cecil Sandy Loam Landscape¹

ABSTRACT

The redistribution of bromide applied to the soil surface at selected positions in a sample Cecil sandy loam (clayey, kaolinitic, thermic Typic Hapludults) landscape was measured in relation to rainfall and pedon characteristics. Three bromide application sites were located in drainageway positions and three on slope positions exhibiting different degrees of erosion. Observations of nearly 4 yr measured 4.7 m of rainfall to show that rainfall was more effective in transporting Br through drainageway pedons than those on the slopes. After 1000 mm of rainfall, half of the applied Br was above 0.6 m on the slope sites and above 1.0 m on the drainageway sites. This difference seems to relate closely to the higher hydraulic conductivity in the Bt horizon above 1.2 m in the drainageway pedons than in the slope pedons. Also, the maximum clay zones in the Bt horizons of the drainageway sites were significantly lower than those on the slope sites and occurred about 0.5 m deeper. At the completion of this study, an elevated Br level was measured in a drainageway site between 1.5 and 2.4 m with no evidence of Br below 3.8 m. These data provide a basis for assigning solute transport characteristics to the identified variability in this and similar landscapes.

Key Words: solute transport • leaching • soil spatial variability

¹ Contribution from USDA, ARS, Southern Piedmont Conservation Research Center, Watkinsville, GA 30677 and the USDA, ARS, Southeast Watershed Research Lab., Tifton, GA 31793.

² Soil scientist, USDA, ARS, Watkinsville, GA; soil scientist, USDA, ARS, Tifton, GA; agricultural engineer, and research chemist, USDA, ARS, Watkinsville, GA.

Received for publication July 20, 1984.

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